Put me firmly in the "I really don't care." camp.
I remember "Die, Monster, you don't belong in this world!" and thinking it was the best thing since sliced cheese. Sometimes 'bad' acting can actually add to an experience.
Thus far? I have no overt complaints, aside wanting one or two voice actors to stay. It's better than most Anime dubs in my opinion. Truthfully it actually, at times, emotional nuance that even some single player video games are lacking. (Most of the time Video games ham up the expressions. I'm glad for the more middle road of emotions here.)
Anyways, here's my judgement marker on people who critique voice actors.
If the words "My s-son!" did not tug the crap out of your heartstrings then you're probably half-dead inside and shouldn't be a judge on voice-over quality.