I've seen quite a few threads where people complain that everyone has a British accent but, for me, I just love it. There's something about the different British accents that lend themselves so well to the fantasy setting. (And I just love the way they sound) And the voice acting is *phenomenal*. I haven't encountered a line with poor delivery yet.
It would be nice to see some more variety but I hope the voices stay dominantly British. I thought the Dragon Age games struck a good balance--most characters had British accents with a few others thrown in and dwarves had American accents.
