If the music is good enough, I can ignore bad vocals for the most part. Unless they're really bad. Screaming/growling doesn't bother me at all, as long as it's good.
GnR doesn't bother me at all. Nor does AC/DC, Iron Maiden, Dio, Rush, Dream Theater, or most of the other bands listed in this thread. Even Smashing Pumpkins, tho I don't really care for the music, so thats what ruins it for me.
What do you all think of this?
http://www.youtube.com/watch?v=uEoGmnoGGtA
Believe it or not, that's a female vocalist.. lol. And yes, I would call that good growling. At least you can understand what she's saying for the most part.
/moshes around the room