The 2.0 MSQ and for most of 2.0x, it doesn’t have much voice acting. But, as you get into 3.0 on more and more of the MSQ quests are voiced. I don’t think we’ll get voice acting in any of the side quests because that’d be way to expensive.
But, then again, I don’t see how that’s a drawback because tons of RPGs aren’t fully voiced. Unless someone is that adverse to reading.