"The KDE community has fixed over 10,000 bugs and implemented almost 2,000 feature requests in the last 6 months. Close to 63,000 changes were checked in by a little under 700 contributors..."
These are numbers quite impressive ;-)
Overall, I think that both Gnome and KDE have reached a really good level of maturation. Linux on desktop is getting every day a more robust and realiable option...