I like Dungeon Siege. Yeah it's not a RPG in the real sense of the word and it's almost arcade like and VERY linear, and I generally like stuff like BG series/Fallout/etc. better BUT all I know is I was hooked on it for the 2 weeks I spent playing it in which I completed it and moved on. It's got really gorgeous graphics, sounds, animation and music. It's a ton better than Diablo, which I don't like even though I've played and completed both, and it's cool to have DS around if you are in the mood to play something quick and easy. In short, it's like a glorified Diablo and if and when they make a Diablo 3, it's going to be tough to beat DS because if D3 was made it probably would be like DS.
NwN is like BG2 crossed with Dungeon Siege, but not quite as epic story as you think from that but not as arcade like either, if that makes sense. Eh... just buy it.