I personally love the game, they still need to patch a few things with the combat. The campaign is great, there is a lot to do. Battles are done in RTS, but campaign map is all turn based like Civ. I personally enjoy it a lot more than Civ 5 because of the RTS battles, theres a lot more strategy to the game IMO. Also if you have a high end computer the graphics are quite beautiful, even better when you have the blood and gore dlc because the amount of blood and heads being chopped off is great ha.
The game has come along way sense they launched it, So if you look it up you will probably see a ton of negative reviews, but those will probably be old. The AI in battles are not overly great, but the AI in campaign can make things difficult for you. Another cool aspect is the co-op multiplayer campaign, you can work with a friend or go head to head in the campaign.