Can't stop playing it, though it's propably the more repetitive game I have ever loaded on my hard-drive.
There are not many different monsters. The same ones come back later in the game, painted in a different hue, with different strength and name. Landscape can be nicely done, though varies very little.
Items... Boy, you are literally overwhelmed with them. No surprise you need a donkey to help you carrying along this useless junk.
Sounds like a boring game... But is it? No. When I am playing it, I simply can't stop and have to tear myself away from the screen to do something else. Why? Well, I guess Dungeon Siege acts like a drug, it's very efficient at melting down your brain. Duh.