In the last version, they broke my Intel graphics driver, rendering my machine almost unusable except for the console. I spent many hours trying to fix it, and ended up switching to Arch out of frustration. I don't think I'm going back, but does anyone know if they've fixed it?
This was a really famous regression. It's not solely Ubuntu's fault, of course; they got bitten by shipping newer software. But yes -- they (Intel, really, not Canonical) fixed it.
They fixed that bug along w/ a few other annoying bugs (pulseaudio, laptop mic, etc). I've been running Ubuntu 9.10 for a month now on my laptop and have had almost zero problems. Only one resume fail in all that time.