Mod parent up.
I was on Kubuntu for the last couple of years. You would think that on a distro whose sole reason for existence is to give people a KDE based version of Ubuntu, that you would be able to get anything done without logging in to GNOME. No dice. Ok...maybe we'll show some tolerance here. Maybe GTK apps would at least be themed to look like they fit in on KDE? Nope. OK...getting harder to stomach this distro. At least, something as frequently used as Firefox would be themed correctly in KDE - file dialogs, menus and all? No dice. In summary, its not a KDE distro - its KDE bolted on to a distro.
I finally grew tired of the constant tweaking required to get things to work right and the constant additional tweaking required every time some update was released. Time to jump ship. Looked around. There were reports of OpenSuse doing a good job. Tried them out. Paradise in comparison. Stuff just works. I can actually administer any part of the system from within KDE. Firefox is themed right - I didn't have to think about it. Guess what? I don't have GNOME installed, because I don't need it. Package management works beautifully and the fact that I can do a one click web install is pure icing on the cake. What do I miss from Kubuntu? Probably the software ratings. However, here is the important bit - has KDE broken once since I installed OpenSuse? Nope. I'm on KDE 4.4. and in 5 days, will be upgrading to OpenSuse 11.3 for some KDE 4.5 goodness.
See, the OpenSuse guys proved to me that a nice enjoyable, stable KDE experience is possible and that by the time I start salivating about the next KDE release, there's a new version of the distro that is ready to release. I'll wait for the distro because I trust them to iron out the kinks for me. They've already done it once. I'm sure they will do it again.
Look, if you're a KDE user and you're on Kubuntu, do yourself a huge favour and at least try out the OpenSuse live CD. A lot of effort has gone into that distro and it shows.