Here we go... autotune is part of most studio's tool kit. personally, I use it a lot. But that is perhaps because I do a lot of arrangements and writing as well, so rather than play a part again, I might just shift a note here and there.
Also, as I said before, when I'm tracking and someone drops a killer performance, but it has a couple of pich errors somewhere, I am NOT going to scrap that performane, because you can bet your nellie its not going to be repeated. This goes for every kind of performance, be it bass, guitar, strings, keys, I have even tuned toms up or down, which greatly improved the whole feel of the track concerned.
Now vocals..... that's another matter. Last year I turned down engineering a CD that would have made me a fortune. Why? Because previously I spend a loooooooooooong time tuning vocals for this artist, which I think is the most non-creative pain in the ass job I've done in a studio. No more!! If I had done it (it would have sounded a whole friggin lot better), looking at the sales figures my one little point would have earned me in the 6 figures. As I'm blessed with ears that allow me to hear when something is not perfect - to much not perfect makes my teeth crack, it does something to my head, I will start barking at people, and if someone disturbs me I'm likely to make them cry, so never again!
Unfortunately there are many artists about who, basically, are not very good. Their singing ability and tone might be really great, but they cannot hold a note. To me, they are not great singers. Live, they fall through the basket, you couldn't pay me anything to go to one of their gigs, and if they are live on TV I go "click" within a second of the first wrong note. If you hear these once live, you know their CD's are autotune specials. Some examples? I'll only mention ones that won't sue me.
Red Hot Chilly Peppers - so bad its almost unbelieveable. Jill Scott - hailed as a great singer, horrible! Seal - Mr. Autotune himself, hail Trevor! Madonna - but she makes up for it by being very clever live, thanks to her brilliant backing singers. Monica - shivers!
And then there are singers who do sing out of tune a lot, but it does not make you cringe, its part of their charm / charisma, call it what you like. Sade is a prime example, Mary J. another one (altough, she has her totally off days! But she can SING), John Lennon was another one, as was Frank Sinatra.
If you would take any of those and autotune their performances, it would remove the character altogether.
In all my time recording I have only met 2 "perfect" singers (non-classical that is), which is unique, like a guitarplayer who's instrument is always in tune and who never makes a mistake. Both these singers have the same characteristics, which is kind of strange. Both have perfect memories, for everything, but especially music. Play them a 10 part vocal harmony, they could listen to it once and re-create it perfectly, be it just after, or a month later. They are also both African, and I don't think that's a coincidence either.
After all that, autotune is just a tool, it makes some things sound better, it screws other things up, and it allows people who cannot sing to pretend they can.
So.... its very much like a printer. A tool you use a lot, widely available, and sometimes used for forgery.