I suppose someone has to mention Two Worlds at this point
...the awfulness of the voice acting is often overstated, and I'd say it's in "so bad it's good"...
Forsooth! I think thee correct!
Yea, it was actually a good touch, even as campy as the VA of the main char was it was fun and added a little "we ain't in Kansas no more" atmosphere. However the monotone whispering of no flair of the main char in TW II got on my nerves quick.
Games like Div:II, TW (The Witcher or two Worlds), DA, ES, etc. seem to translate better with full voice acting. D:OS, BG, Torment etc. seem to work better with the partial VA.
Haven't quite pinpointed why it seems that way, maybe cause of the mechanics of said game.
Skyrim seemed to have a good ratio of text being spoken (as far as the length of lines spoken), yes you could read faster than what was being spoken, but I usually just ignored the text and listened.
Now if a story rich NPC heavy narrative driven game was fully VA'd you would be sitting there for quite some time as the NPC would essentially be reading you a bedtime story.