A nice little time waster.
Having said that, I have to admit that Dungeon siege is not a bad little game.
I had dabbled with Diablo in the past and found it rather uninteresting and uninspiring, so why would DS be different.
Well, for me, it has alot to do with the donkeys. I like the fact that I am not hobbled in any way by the limit of what I can carry, so exploring is much more fun.
But this IS still a dungeon crawl, and it can get a little boring for me (I also play Guild Wars and that has grown VERY boring for me after creating and beating the game with 2 characters).
But, all in all, graphically it's a very pretty and play-wise it's a great time waster.