This is what auto tune should be used for. It's to help those who can't sing have the ability to sing. Yes, I know there is a joke in there, but the famous singers who do use it actually have talent (well, the ability to hold a note anyways) and they certainly don't need a machine to pitch correct their voice.
In short, I don't play Rock Band, but I think the addition of auto tune will be welcomed by most.
In short, I don't play Rock Band, but I think the addition of auto tune will be welcomed by most.