Well, look at it this way: I play without a mic and I have played Realism Versus and didn't really care either way about who won, so I suppose you're right.
I hope one of the modes is a continuous survivors vs. Infected mode where you stay with the team you're on until the end. I don't know why, I just think that'd be cool. Also, a mode where the humans have Infected powers and the Infected have guns.