Edit, 3/7/19: Still lots of bugs, no hard AI, and almost a year into release. Disappointing, but I still hold out hope.

TLDR: 7/10. A great board game port somewhat hampered by its mobile roots.

Let me get the bad out of the way first, this is a mobile port with very little enhancement for PC and it shows. The game's use of screen real estate is very unoptimized for large screen monitors. Large Icons and game elements could have been shrunk down and more elements of the board game allowed to occupy the main screen. Two side menus on each side of the game could be left open by default, but everytime you restart the game and even when your turn comes back around, the menus are tucked away again, they should stay open by default as they don't obstruct anything.

Some newer players have complained about constantly having to access information hidden away in menus. This is only partially true as most of the info an experienced player needs is on the main screen. For the benefit of those experienced with the game I'll list the menus that people think have info hidden away and what is actually visible on the main screen without opening those menus. Satellite menus include: resource exchange screen with power bowl, town tile screen, players score status screen, player bonus tile selection screen, favor tile screen, cult track, power tiles, round score tiles. The main screen does present you with a lot of that info without opening those menus including, with the side menus open: home terrain with terraforming costs for other terrains (left side menu open), current round score tile and power tiles available to use (right side menu open). Player info cards at the bottom include: current workers, coins and priests available and income levels for next round, power bowl summary, cult track positions. So that's quite a bit of info available reducing the need to open those menus.

So the real star here is the board game itself. Terra Mystica is deep, complex, and presents you with many choices each turn. The game consists of 6 rounds of expanding your fantasy empire using different factions all with their own unique powers. A round consist of 8 possible actions with each player taking one action then the next player taking their action, this continues until all players have passed and then the next round begins with each player recieving their income and performing their actions again. Every round has a different way to gain points so many of your action choices will revolve around what will score points during that round. The game has some interesting synergy, when you build certain structures next to a neighbor, you get a discount, in turn, they get the option of gaining power at the cost of some victory points based on the value of their adjacent buildings involved. Power is very important for some actions, but so are victory points, so it's an interesting trade-off to consider. There are many ways to earn points throughout the game and of course the winner is the faction with the most points at the end of round 6.

A future expansion "Fire and Ice" are included in the price and will add more factions and game elements.

Single player has 4 easy AIs based on time starting with a 1 second thinking AI up to a pretty tough 15 second thinker. A Medium and Hard "learning" AI are promised in a future update.
Multiplayer has chat and is cross-platform so you can play with Android and iOS players and games seem readily available.

A lot of reviews and players have bashed the tutorial pretty hard. I'll just say that this is a complex game and writing a long complex tutorial to cover all elements of the game would have been an expensive time sink for a small team, so I personally had no problems reading up and watching some cardboard playthroughs. I didn't bother with the tutorial.

Overall, I find Terra Mystica a gem of a board game and can easily forgive the shortcomings this digital implementation has. A must buy for true board game fans.

Pros:
Uses original board game art with only a few digital embellishments.
Easy AI is pretty good with harder "learning" AI to come.
Fire and Ice expansion will be included in a future update.
Deep, thought provoking gameplay with little left for chance.
Cross Platform play for multiplayer.
Ability to play a deep boardgame on something other than a phone/tablet.

Cons:
Mobile roots are obvious.
Oversized elements meant to be visible on mobile are oversized on large monitors.
Screen real estate not optimized for PC monitors, needs more game elements on-screen.
No tooltips make it a little tough for newcomers.
Game is too complex for the tutorial, newcomers should probably watch a cardboard playthru.

Edit, 3/7/19: Still lots of bugs, no hard AI, and almost a year into release. Disappointing, but I still hold out hope. TLDR: 7/10. A great board game port somewhat hampered by its mobile roots. Let me get the bad out of the way first, this is a mobile port with very little enhancement for PC and it shows. The game's use of screen real estate is very unoptimized for large screen monitors. Large Icons and game elements could have been shrunk down and more elements of the board game allowed to occupy the main screen. Two side menus on each side of the game could be left open by default, but everytime you restart the game and even when your turn comes back around, the menus are tucked away again, they should stay open by default as they don't obstruct anything. Some newer players have complained about constantly having to access information hidden away in menus. This is only partially true as most of the info an experienced player needs is on the main screen. For the benefit of those experienced with the game I'll list the menus that people think have info hidden away and what is actually visible on the main screen without opening those menus. Satellite menus include: resource exchange screen with power bowl, town tile screen, players score status screen, player bonus tile selection screen, favor tile screen, cult track, power tiles, round score tiles. The main screen does present you with a lot of that info without opening those menus including, with the side menus open: home terrain with terraforming costs for other terrains (left side menu open), current round score tile and power tiles available to use (right side menu open). Player info cards at the bottom include: current workers, coins and priests available and income levels for next round, power bowl summary, cult track positions. So that's quite a bit of info available reducing the need to open those menus. So the real star here is the board game itself. Terra Mystica is deep, complex, and presents you with many choices each turn. The game consists of 6 rounds of expanding your fantasy empire using different factions all with their own unique powers. A round consist of 8 possible actions with each player taking one action then the next player taking their action, this continues until all players have passed and then the next round begins with each player recieving their income and performing their actions again. Every round has a different way to gain points so many of your action choices will revolve around what will score points during that round. The game has some interesting synergy, when you build certain structures next to a neighbor, you get a discount, in turn, they get the option of gaining power at the cost of some victory points based on the value of their adjacent buildings involved. Power is very important for some actions, but so are victory points, so it's an interesting trade-off to consider. There are many ways to earn points throughout the game and of course the winner is the faction with the most points at the end of round 6. A future expansion "Fire and Ice" are included in the price and will add more factions and game elements. Single player has 4 easy AIs based on time starting with a 1 second thinking AI up to a pretty tough 15 second thinker. A Medium and Hard "learning" AI are promised in a future update. Multiplayer has chat and is cross-platform so you can play with Android and iOS players and games seem readily available. A lot of reviews and players have bashed the tutorial pretty hard. I'll just say that this is a complex game and writing a long complex tutorial to cover all elements of the game would have been an expensive time sink for a small team, so I personally had no problems reading up and watching some cardboard playthroughs. I didn't bother with the tutorial. Overall, I find Terra Mystica a gem of a board game and can easily forgive the shortcomings this digital implementation has. A must buy for true board game fans. Pros: Uses original board game art with only a few digital embellishments. Easy AI is pretty good with harder "learning" AI to come. Fire and Ice expansion will be included in a future update. Deep, thought provoking gameplay with little left for chance. Cross Platform play for multiplayer. Ability to play a deep boardgame on something other than a phone/tablet. Cons: Mobile roots are obvious. Oversized elements meant to be visible on mobile are oversized on large monitors. Screen real estate not optimized for PC monitors, needs more game elements on-screen. No tooltips make it a little tough for newcomers. Game is too complex for the tutorial, newcomers should probably watch a cardboard playthru.