Since I didn't want to flood your comments section with long posts, here's a discussion about my personal thoughts on the trinkets. SPOILER WARNING for people who don't want to know anything about the trinkets.

Alright, well let's start from the top I suppose:
**So turns out, I'm like 4 deep here and this is just... too much writing. I honestly can't be arsed to give feedback on every single one of these now, so I'm just going to highlight the best and worst ones. If I don't talk about it after the BH's Mask, it's firmly in the C-Grade "meh" category.**

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Abomination - C - This is firmly in the "okay I guess" sector. The downside of a little extra stress is almost unnoticeable on a class who has a pretty solid self-stress-heal. That said, DOTs for 1/3 are nearly unnoticeable as well, so I suppose it's a good fit.
It takes a minimum of 3 turns of focusing one enemy to get it to any respectable amount of DOT and that only happens against bosses and the most tanky enemies. Trinkets that apply DOTs also only affect the front-most target in AOE attacks - per DD's engine - so it's not like we can combo it with his multi-hit attacks to amplify this trinket's effects.

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Antiquarian - F - This trinket is deceptive in appearing to be good, but incidentally being terrible. The trinket reduces her base health to 7-11 (depending on level) which is enough to be Death's Door'd by pretty much any hit by enemies at that same respective level.
"But permanent Stealth!" one might say. The actual effect of being Stealthed is that you can only be hit by AOEs, and single target attacks that could otherwise hit her go to somebody else instead.
That has the exact same gameplay implications as being Guarded, which she has a skill that forces allies to do. In fact, since force-Guard lets you choose the redirect's target, permanent Stealth is actually *worse* than Guarding in this case.
So the actual effect of this trinket is: "Make yourself 1-shot DD'd in exchange for freeing up your first turn and every 3rd turn for another action". And let's be honest, getting extra action economy on an Antiquarian is laughable. What am I going to do with that extra action every 3 turns? Get another +3 Dodge buff? Stab somebody for 5 damage? If doing those things would make the difference in winning or losing a fight, I'd just be straight up doing those instead of Guarding myself anyways.

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Arbalest - FFF - Exceptionally bad. Like, flat out. Not even a debate. There's no use case for this trinket. Let's go down the trinket's effects and why every single one, even the positives, are terrible:
+500 ACC against Beast. Arbalest already has *THE HIGHEST* ACC stat - on average across all skills - of any class in the game. Making her already nearly-perfect accuracy into actually-perfect accuracy is not that much of a boost. Especially since it's only against a specific subset of enemies. How specific that set is I'll cover below. You could take a Steady Bracer (Uncommon trinket) and come pretty darn close to the same efficacy, but it applies to all enemy types instead of just Beasts and doesn't come with nearly 1% of the drawbacks this trinket has.

+10% DMG against Beast. So let's break that down. Let's look at her best-case damage: Sniper Shot against a Marked Target. 6-10 damage at Level 1 Crossbow, 11-21 damage at Level 5 Crossbow. Having this trinket increases that numbers to 7-11 at Level 1, and 12-23 at Level 5. So AT BEST this gives her +2 DMG. Against Marked Targets. Of a very specific Type.
Admittedly, there's 32 enemies in the game that are in this Type, but if we look at how that actually breaks down, you'll find the actual effective list is much smaller: 1 Beast is exclusive to the Mill, and you're not taking this trinket there for just that. 10 of them are exclusive to specific missions within The Darkest Dungeon itself, so unless this Trinket is aimed at only the final 3 missions, we can safely discount these guys as counting. 3 are exclusive to Shieldbreaker Nightmares, and the last one is the Shrieker who only shows up at rare, specific times.
If we remove all of them from the pool, that leaves only 17 Beast enemies that this applies to. By the same categorical filters of what "counts", that's compared to the 22 Human enemies, 16 Unholy enemies, and 25 Eldritch enemies. So we're talking about the 2nd smallest category of enemies this applies to in the game. For +1-2 damage. Hell, it's only +1 if the target isn't Marked.

+200% Food Consumed. This is a massive penalty. This makes the Arbalest eat 3 Food on every check. That's 6 Food per check for the party. On a Medium Dungeon, 1-6 Hunger Checks are possible (without making nonsense map movements) but getting by with only 1 Check is only happening on Boss Mediums where you head right to the boss and do nothing else. Since only the Swing King is a Beast, we have to assume this trinket was not designed for Boss hunting, but rather for normal missions in which you explore the majority of the dungeon. The average number of hunger checks for a Medium is a value between 2 and 3 at Radiant Light so let's look at both cases.
For 2 checks, you're eating 12 Food. If you buy the entire store's worth of food for a Medium (24), you have enough to camp and Feast afterwards. If you get 3 checks, you're eating 18 food. That only leaves you enough for a standard camp.
But if we stop using Radiant Light Hunger Checks, it becomes a lot worse. Let's look at the other side: Black as Pitch Hunger Checks. Statistically, you're looking at 4-5 Hunger Checks (on average) in a Medium if you're running Torchless. Well, 4 checks with this trinket is all of the food you can even buy from the store, plus now you can't camp. If you roll on the other side of the statistical range, you're looking at all of the food in the store, starving at least once, AND not having a camp. So this Trinket (if it wasn't already out for the lackluster positives) is entirely out of the question on Torchless.

-12 Dodge. As if this trinket hasn't kicked us in the nuts enough, we are also going to be getting rid of the Arbalest's only defensive stats entirely for the first 3 Armor levels and reduce it to nearly nothing for Level 4 and 5 Armor. -12 Dodge is grievous on any class, but especially on the Arbalest because it's basically guaranteeing that she's getting hit any time she's targeted since she already doesn't have a lot of Dodge to give away.

0/10 - Nobody should use this trinket, ever, for any reason. You're literally better off selling this trinket and using the money to buy a Crossbow upgrade for your Arbalest instead.

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Bounty Hunter - B - This one is a little hard to evaluate because it changes relevant party compositions that you'd take on the mission in the first place. But I still think it's quite a solid boost. It just requires you to change things like party members and trinket compositions to make it work.
You can probably still run a Marking Party with this trinket. You'd just need to make sure everyone else in the party has +SPD to ensure that they're going before the BH is. The -SPD on the Mask helps that along, but it's still not enough to guarantee he goes last when you have somebody like... the Arbalest in the party. It just ties for her SPD, so they'll - on average - alternate who goes first. If you manage to set it up so BH goes last, you can maximize your +Mark effects with the rest of the party, and then the BH can kill off a target with a heavy finishing attack. Since the target is dead, consuming the Mark doesn't really affect much. Despite that, I think taking this in a Marking Party actually weakens the party's overall effectiveness because of the trinkets you have to give up to make room for +SPD to play around the BH eating the Marks. This does however, open up the Solo BH play. If you can drop his SPD enough that he goes last in the entire fight, you maximize the chances that he applies Marks to enemies so he can hopefully slap somebody off the face of the earth once his turn finally rolls around. The BH already hits like a truck against Marked Targets, so the +25% DMG just seems like it's cleaning up the edge cases where the BH's 30+ DMG attack left an enemy with 1 HP or something. Overall, it's not my cup of tea, but I think it's... just a good trinket. Nothing to write home about, but it's solid.

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Flagellant - D - So, he can't Crit anymore without at least Weapon Level 3 unless he's Bleeding. And that's only on Punish. His other attacks just can't Crit - no matter the weapon level - unless he's Bleeding. He also gets +20% Stress when not Bleeding. That's on par with Collector trinkets and even more than Ancestral trinkets. Let's see if the upside is at least as good as an Ancestral trinket.... No, no it's not. The upsides require I be Bleeding (an activation cost, which is yet another downside) and gives me only as much Crit as an Ancestral trinket does while giving me double the stress and having a setup/activation requirement. Maybe the goal is for these to be weaker than Ancestral trinkets. Great then. Objective achieved, because I'd immediately replace this with an Ancestor's Pen or something for similar effects at lower cost.
I'm sure you noticed I skipped over the -Stress while Bleeding effect. That's because it deserves as much attention as I gave it before now. If you're playing a High Stress Flag, it actively slows you from getting there. If you're playing a Low Stress Flag, it's almost negligible. It doesn't help de-stress or really help you get to a Low Stress state.

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Grave Robber - F on Apprentice, B on Champion - This trinket has a weird power level because you've directly tied its effectiveness to what level dungeon you're taking on. On apprentice dungeons, this is basically worthless. You get +5% PROT, which might reduce damage by 1 on a good day and you're gambling really hard on that slim, 3% chance of finding the right Gem. On Champion, you've got a 20+% chance of finding the relevant gem in any given loot drop, so you're way more likely to be able to trigger the effects. The effects are fantastic on a GR. Easily A or S-tier effects for this class, but it drops to a B simply because you have to gamble on getting it still and there's no guarantees. In a game about managing RNG, introducing extra layers of RNG to be successful is a suboptimal strategy.

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Houndmaster - S - This trinket is nuts. -10 Dodge is pretty hefty, but the Houndmaster is one of the few classes that can take that hit and not be too upset about it. He's got a lot of base Dodge. Scouting is OP in Darkest Dungeon. Being able to know exactly where to go cuts down on the amount of supplies you use, the amount of risks you need to take, and directly correlates with your ability to succeed with minimum casualties and maximum loot. This trinket gives you even more Scouting chance than the Ancestor's Map does and that's pretty widely regarded as a top-tier, must-take Trinket because it gives you +25% Scouting chance. If you could be so blessed as to have both this and the Ancestor's Map in your inventory at the same time, you're basically scouting the entire dungeon on every run and finding the Secret Room on basically every 2nd Mission. Having to hold back on eating 1 Dog Treat and forgoing 1 round of slightly better attacks in exchange for perfect information on the dungeon is not even a choice to think about, especially since you can always eat the last Treat on the final fight of the dungeon after Scouting literally everything.

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