But music feels... dunno, much personal, and more subject to one's own preference.
I mean, I think that someone feels more entitled in listening to Learning to Live and say "meh, this song totally sucks for me" than claiming that Moby Dick is an horribly written book.
Sure, if you press someone hard enough, they will concede that yes, that classical piece of music is good and that a random jazz improv player has the skills, and so you can get someone to admit that Petrucci is a good guitarist, but if someone listens to Learning to Live and gets bored 3 minutes in, he'll just think that the song is bad and that DT is not for them at all. They'll probably go as far as claiming as not understanding what the fuzz's about (or complain about James).