I don't have anything against maj 7th chords in the right setting. In fact, one of my compositions uses five of the little buggers. But, I think that is the only piece I do that even has a single one. They're not very versatile things are they? You can't substitute a maj 7th for a more common chord the way you can a 9th or a minor 7th unless you want some really funny looks from the rest of the band.