Interesting points above about negative feelings about art. Traditionally, art was meant to be uplifting or to arouse noble feelings, but modern art has discovered the power of negativity. That is, if you look at Duchamp's urinal, and you find it repellent, then Duchamp chuckles.
Of course, this is all a matter of taste. But I don't think you can define art in terms of noble feelings really. Art is a matter of transactions between studios, galleries, collectors, museums, and so on. It's that stuff which is transacted. This is what is meant by anti-essentialist theories of art, although of course essentialist theories still exist. In fact, there is a half-way house, where you have a bit of both.