It's hard to believe that almost all RPG's your find someone moaning about the voice acting. As an English man Divinity II is amazing!!!
That's because
1, some people are just 2 hard to please
2, somepeople just like to complain even if their complaint is groundless
every game has it's flaws & you'll never have a game that does'nt have flaws in the voice acting in one way or another. DKS though is one of the better high quality voice acting games & if you can't recognise that then there really is no hope of pleasing you.