I would be a bit more enthusiastic then Robnark.
I think it's one of the better CRPGs to come along in recent years, though the first dungeon reeks of Diablo. After that point, however, it begins to feel a lot more like Ultima VII, with a huge range of quests, lots of NPCs, a number of interesting puzzles, plenty of spells, skills, and items of interest. Unlike Diablo--and again, like Ultima VII--the landscape is "full," rather than an abstract between Town and Dungeon. You'll want to travel every inch of turf in order to see the odd things that are along with the way. It's pretty interactive, as such things go.
One problem: save often. Do this especially before you move between map zones (there are four in all). Although the game is a lot more stable than it was when it first appeared (and you've downloaded the latest patch, right?) it still has a tendency sometimes to freeze as you travel between map zones.