There's overall nothing wrong with the voices. One or 2 do annoy me at times...

There's one guy who does a lot of the smaller npcs likes guards and stuff and he sounds a little like Ringo Starr doing thomas the tank engine narration!!

The death knight VO just gets better and better as the game progresses.

Also the one of the few other bad voices (and acting) in the game is the mature woman who does a couple. (she was the witch locked up in the abbey at one stage).

Overall they're very good and fun, better than reading text most of the time.

I read text faster than the speaker, but if I like the voice I let them finish.