I haven't upgraded to Mountain Lion yet, and probably won't. I did muck about with it at the store once, and wasn't impressed. It's pretty bloated, and that is what surrounds most of the complaints I've seen.
It also does away with Front Row, and I loved Front Row because I dig movie trailers.
My larger point is, anyone that says "Mac users are just suckers for marketing and stroking their ego" hasn't met me and probably doesn't know as much about technology as they think they do. And I'm willing to compare resumes with anyone.