I want first and foremost to be entertained. Lynch fails completely to entertain me. Then I want a movie to say something. Lynch doesn't say anything. You can start watching a movie like Mulholand Drive with your brain switched off because you're not going to need it anyway.
It's like the theater of the absurd without which the world would be a saner place, too.
I still think it's artsy posing rather than anything with actual content. But I might be old-fashioned in my insistence that art should be anything but its own excuse. In UA terms, I guess the old archetype of the artist who is able to do something, create something, using skills, and giving it some kind of meaning is ousted by the dabbler with the better computer. Heck, I even do it myself.