While I think adding voices for every dialogue would be overkill given how many voices are present in the game, I would have liked actual CHOICES in the game. In Guild Wars 2 our personal story actually felt personal because we actively made decisions which affected the outcome. Here it's very railroaded, and as a result our character feels like a bit of a tool.
We don't even take an active stance when people we care about are in danger, nor even preemptively strike people we know to be evil. They're a blank slate in the worst possible way. I get that the idea is to allow us to project our own personality onto our characters, thus they have to be devoid of one, but it just reinforces the concept that we're too stupid to do anything besides blindly follow quest markers.
If there as a quest-giver who said to assassinate the three city-state leaders, our dutiful adventurer would probably do it just for the experience.