I don't think I have ever been this depressed by a game before. As the spiritual successor to Dungeon Keeper, I had very high hopes for this game. It is, saddly, terrible. Everything that made the previous game unique and interesting (monsters moving into and interacting with your dungeon, converting enemies to your cause, waging war against the forces of good,) have all been stripped away.
Yes, you can place monsters in your dungeon and have them protect narrow areas, but they don't roam the area, they don't interact with your dungen, and there are very few types available. The troll/blacksmiths are gone, and so are their traps, doors, and other gadgets to make the dungeon interesting. The prisons remain, but the Mistresses are gone so enemies can't be converted. The only reason you even capture them is to get soul energy out of them.
You no longer wage war. Yes, you can fight heroes, and your mosnters will too. However, you can no longer send your monsters after heroes, they will only engage if the hero happens to stumble into them. Of course, you wouldn't want to send monsters after heroes aanymore either, since they need to survive to be fattened up with soul energy.
It is like they tooke the most basic features of Dungeon Keeper, kept those, and threw away everything that gave the game character. Now, you must run about taking care of every little task using your avatar, with no help from the decorative monsters. Basically, this has become FarmVille with a slightly darker background and sub-par voice acting.