I've used Kubuntu (and Xubuntu) earlier, and, well, I like them all. But personally I prefer OpenSUSE because of RPM system and YaST2 - a control panel is really lacking especially in Xubuntu. Kubuntu has the KDE control panel, but it's still not enough for me, since you can't change things like sound devices there.
As for it having bugs - I haven't noticed much, although I have to agree that I had to do less to make 11.2 work and I'm still having issues, but those are mainly due to FGLRX, so it's not Novell's fault. Not sure about patches, too, since I'm not that much concerned with security on Linux. Not many people are trying to hack them anyway. As for difficulty to work with - that comes down to the person, one might like one setup better, the other prefers another.