There's nothing specifically wrong w/ using some autotune. Some songs actually sound better with added autotune effects, but a heavy amount is ridiculous. I also see nothing wrong with it if you can sing your ass off LIVE.
Autotune is killing music. Guitar groups are on the way out. Bootlegging is going to destroy the music industry. Napster is robbing artists of their profits. CDs will never be big enough to replace cassette tapes. Illegally downloaded digital music is killing album and record sales.
I have no problem with autotune making a track sound more perfect for repeat listening as long as the artist can duplicate it reasonably well LIVE. If they can't then
I really think its use as a special effect is going to reach its peak soon though, since everything gets old eventually...