Pretty nice, addictive and interesenting, but not perfect, not even close to being perfect.
Gameplay - The gameplay is sort of neutral, between bad and good. It has its own minuses and pluses as always, but I find more minuses in Campaing than pluses in Campaing. The Campaing truly s*cks, you cannot even play a naval battle, so you just have to get a strong admiral and many men together to survive, otherwise you simply win and loose by the amount of men you have. Quick Battle is pretty cool, but lacks naval battles. 8/10
Overall - I have really enjoyed this game, and there's really barely anything to add, but there are many things that should be fixed, including few annonying bugs. And I wish there would be more playable factions in campaing than the standart 3 and the others you get after beating game with any of the 3 standart factions. But, this is yet the best game about that time I ever saw, I really enjoy Total War series.
P.S If the game doesn't seem promising for you, then simply rent it or download the demo - you wont regret it, especially after you have played the multiplayer, that I managed to play only about 3 hours totally.