I can understand both sides of the argument, even though I personally vastly prefer unvoiced protagonist (though battle cries and occasional comments are fine, so long as there are a range of voices to choose from, like in DA:O and BG1 and 2).
I've had a hard time connecting to my characters in DAI and DA2 because they're stuck somewhere in between custom-made and pre-made. I can design them physically the way I want, but no matter what kind of personality I want to give them, I won't be able to do so freely because their mannerisms and voices will always be determined for me. Sure, there are a few options to choose emotional responses, but you will never be able to make ex. an Inquisitor as silly as Sera or as haughty as Vivienne, if that's even the right word. I love that Larian are making the protagonist have a lot of facial expressions (though I wish the player could decide what kind of behavior would suit their character in the CC, ex. stoic, smug and so forth), something I feel like DAI lacked a lot apart from some scenes.