Most surprisingly, Gnome 3 does not feel like a compromised choice in comparison to OS X. It's not a seamless experience by any means. That said, I'm really digging some of the UI choices they've made. It's a UX that's committed to a vision of how the user should interact with the computer.
I remember a time when the Mac also felt like a strongly opinionated experience, designed by and for humans. It no longer feels so. It feels aimless and stagnant, even regressive in some ways. It feels designed by committee rather than vision or voice. The changes do not seem to serve any higher purpose than making the UI look cool in screenshots. I miss the high-contrast controls, readable fonts, always-visible functionality, personable quirks, etc.
I still use a Mac all day at work, and I still respect it as a good tool for getting shit done, but I really wonder about the point of it. If I can pick up a free alternative like Ubuntu Gnome and actually feel happy and productive quickly, what's left to recommend the Mac? If Apple doesn't care any more, why should I?
(Alright, now y'all can light me up.)