Autotune is just another tool in the producer's toolkit. And by tool, I really mean instrument. Like any instrument, you can't just use it and automatically make a blockbuster hit. People have tried...

Good music is good music, no matter how it's made, and I have a lot of respect for someone like T-Pain who's basically single-handedly proved that Autotune can provide powerful emotional effect in songs. I also have no problem with helping pop stars sing better, on albums and in live performances. I prefer the best product for my bucks, if at all possible. I trust a producer like Rick Rubin to know when to employ what techniques to a record to maximize my enjoyment.