The problem is that Ubuntu is not focusing on the fundamentals and they're not putting enough money into testing.I think you made my point more succinctly than I did.
I think the UX was just fine in last year's Ubuntu. You could argue about whether Gnome 2.x was as slick as Windows 7 or OS X (I think it was at least better than Windows), but I don't think there's much doubt the system was usable by non-geeks. The first thing to break for me was suspend/resume, with one of 10.10's kernel updates. I reverted to an older kernel and hoped 11.04 would fix the problem. It didn't, and it precluded running the older, working kernel. Performance also got worse, and I can't think of any noteworthy improvements as I didn't consider Unity ready for prime time.
So then 11.10 came out. Reviews said Unity was great now and everything ran smoothly, so I pulled the trigger on the upgrade. Unity did, in fact mostly work, though it was slow and glitchy. Oh well, back to Gnome Classic. Of course, it's Gnome 3 now and I can't even move the clock. That won't do, but I've heard the new Gnome 3 gnome-shell is awesome, and I have a video card that can handle it. It loads, slowly, but UI components sometimes vanish when I try to interact with them. Eventually, X crashes. Oh well, that gives me an opportunity to see what progress KDE 4 has made. I can report that the error messages for Plasma crashing look like they've had some attention from a designer since the last time I saw them. Good work.
I'm running Linux Mint Debian Edition with Xfce now. Still no suspend/resume, but everything else works. The Linux desktop experience is almost back to where it was two years ago. Yay leadership!