Cossacks II is a good game. I believe I'm in the minority when I say this, but I oh so strongly believe it.
Compared to the original Cossacks video game, it's distinctly different. The visual style, gameplay/gamefeel, and even the setting are radically different from Cossacks: The Art of War. It's not hard to see why fans didn't like this one or it's vanilla version. But if you really give it a chance and look at it as a nonsequel, you may see a very good game in it.
For those not in the know, the overall series has features like troop morale, limited ammunition for gunpowder weapons, commanding and management of troop formations, and a visual style that invokes the image of paintings from the era coming to life. It's an extreme different game from say, Age of Empires or Total War, despite the simularities. The learning curve is slightly higher than those games aswell. Battles are often stalemates that have to be broken through concentrated attacks, flanking, and clever usage of terrain features.
This game is more or less dead and its developer, GSC Gameworld (Who is known more as the team behind the STALKER franchise of FPS games), is in a state of pseudo non-existance. But please, buy this game. It deserves more love and attention!
Add me if you want to play multiplayer sometime, I would greatly appreciate that.
And for anyone who disagrees with me on the games quality, come on, at least it's not as bad as Napoleon: Total War...