If you want to avoid regressions, don't upgrade until they've had a few cycles of fixes. Especially for .10 releases. Ubuntu ships early and breaks fast, and then slowly fixes the breakage - if you don't like that you'l want to let others be the guinea pigs first.

Come to Xubuntu, 12.10 works perfectly.

Yeah, that is what I heard. Which makes me wonder what went wrong in the main distribution.

possibly trying to move in too many directions at once. xubuntu used a relatively stabler and better-shaken-out desktop, which meant one fewer moving piece to introduce incompatibilities.

They decided to copy Apple and have an "innovative GUI". Surprise, surprise, it turned out shitty, just like OS X.