er, by that u mean someone who sweep picks? if that is the case, i must disagree. as vaiyen said, music is about self-expression. to add on, i think music is about learning, and about growth. so there really isnt a who pwns who or stuff like that.
imho, sweeping, shredding, and what not are just techniques that add flavour to someone's music. used excessively, it can become a mite boring. so i think that a healthy, and good musician, should be able to blend a balance of both impressive techniques (for shredding fans etc) and a nice melody that can keep playing in people's head.