This does indeed seem to be a very divisive feature. I'll always be for a voiced protagonist, because it seems like I lack some imagination some other people have. When I read text I never hear it as a voice in my head, I just kind of absorb its meaning as I read it - sort of like when you think you are hungry and will go make something to eat, you don't think in your head in a voice: "I am hungry, I will go and make me something to eat". People talking about imagining a voice in their head as they read lines seems very alien to me.
That's why silent protagonists are always lifeless to me.
