So now that we've had all the race weeks, it is easier to take an overall look of the different voices in the game.
For reference, the ANet blog posts where race voices were featured:
In addition, there is this voice design blog post with some extra clips.
So what do we think?
Personally I think that the Asura voice is the one that feels most believable. Although overall I like the actual voices. Where it is not as great though is the actual flow. I think a lot of the dialogue still feels "unnatural", as in really feels like text being read out loud in stead of actual flowing conversations. If this is due to the writing, or direction, or both, I cant really say. And I would like at least some of the races to feel a bit more "americanized".
I guess it is kinda late for that, but getting help from professional TV writers (or even better TV writers from animated shows) and/or directors I think would do a great deal to really get that "flow".