Oh, well I've never downloaded off of iTunes or anything so maybe I just don't know the difference between good and bad quality. Because I get a lot of my music off of youtube and it's all fine for me.
I never noticed the difference until I installed a $1200 sound system in my car. I have now realized YouTube ripped music sounds like it was recorded from a Barbie Sing-With-Me tape recorder, and can even do damage to your speakers.