Ubuntu's quality control has been very bad recently.
Audio wise, 8.10 on my system silences itself every 2-3 days. Maybe it's PulseAudio that fucked up. It refuses to play any media. Have to do a restart.
Firefox under Compiz always starts full screen, covering everything. I have to press F11 twice to get it back to normal.
All those big and small problems creates a feel that this system is not so stable... which reminds me of Windows