I want to quickly apologise. I got a bit incensed with my earlier response and kinda veered out from just discussing the topic and got into voicing my frustrstions with the game, and I feel I did so in an overly hostile and dismissive manner. That wasn't cool of me and I shouldn't have gotten caught up like that.
On the topic, I do hear people's claims that Tav isn't really a blank slate and so voice acting is appropriate. I don't think that's wrong necessarily, but if that's the direction Larian wanted to go, then they'd need broadcast that better in marketing and more importantly, gameplay. They should leverage that aspect of Tav as shepard-like semi-defined character to give our character more grounding in the setting, something thats severely lacking in Act 1 as a whole.
