So TLDR, with outdated bugs included, I rate this addon a 5.5/10. However, were it not for the bug, this addon would score a solid 8.5/10.

Overview: The Chicken NPCs are entertaining and funny but also can be nerve-racking and hilariously scary. Their HP mostly seems appropriate for their type, save for maybe a few exceptions. Minecraft chickens actually walk like MC chickens and the Hell Chicken's theme song is very fitting. It's also great that the combine chickens can be allied with Latrop's Chicken War npcs. Overall this is a solid mod if you want some crazy chicken npcs for all your Zelda, Skyrim, and Gears of War 3 PTSD.

Improvements: There are a few minor tweaks I'd advise upon. the first being some of the chicken's HP seeming a little off. for starters...
>I'd believe that military chickens would be tougher than 15 HP since they are in the military. Personally I would do something like 30-60 hp instead.
>Zombie chickens are undead chickens and we all know how resilient zombies can be so I personally feel they should at least have 75 HP to compensate for their slowness
>Hell chickens should be immune to fire damage or at least highly resistant to it
>Angry chickens seem to have poor line of sight and no wandering. IDK if this is on purpose, but it makes them easy (and slightly boring) targets unless you run in front of them.
>Maybe include a run down on chicken allegiances, as while many of the enemy chickens are allied with each other, many of the friendly chickens are not, leading to in-fighting among your feathered friends.
>Finally, even before the bug/update occurred, the Giant WTF Boss Chicken would just kinda sit their flapping it's wings. I feel like it could use the same animations as normal chickens.

The Bug: the biggest issue plaguing this otherwise awesome addon is that half the chickens don't work anymore. Specifically the chickens with the standard brown chicken model will just kinda float in place, half-assedly flapping and not moving (except in the case of flying/jumping chickens), leaving several of the chickens stuck and useless unless you get in their face.

Suggestions, but not expectations:
>A spawner would be nice. Especially one that plays "Chicken Attack" by Takeo Ischi
>WTF Boss Chicken uses the full Richie Kavanaugh song of chicken talk (idk how much mb this would take up)
>IDR how fast Jihadi chickens moved before the bug/update, but I feel these should run at you
>Minor nitpick, but I feel the demon chicken could either have more HP itself or it should do lingering damage when it hits you.
>Military Chickens can use guns (thought from what I understand this is difficult to code so I won't hold my breath)
>IK the WTF Chicken is basically an earr@pe meme, but I feel this has potential for other meme sounds instead.

Ultimately, this is a fun addon and you should give it a try, especially if the creator manages to update the mod to fix the normal textured chickens.
Edit: It would appear that the bugs of uselessly flapping chickens has been fixed, therefore, I give this addon an official 8.5/10