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SuSE 11.2 is working fine here and KDE 4.3 is the first iteration I've found fully usable since the 3.x series a couple of years ago. It's been a long wait, and I agree about the paleness of the themes. But that is easily fixable by downloading some alternative colour schemes if none of the stock ones is to your taste. That said, I've only switched over from Gnome in the past couple of weeks. Gnome worked very well on 11.2 too.
I've had no problems installing Nvidia drivers both from source and ready-rolled (as from today) from Nvidia's Opensuse repos. In fact I've been following 11.2 for a while, upgrading through a couple of milestones and an RC from 11.1. It's been a fairly pain-free experience and the only other distro I could say that of with regard to rolling updates is Debian. However this is undoubtedly easier to do on Debian because there are only three main branches: stable, testing and unstable. There are a many more repos to contend with on SuSE and you have to be very careful about switching between them or your update plans will go boom.
I guess it is too early to say how polished and useful this release will turn out to be. But it is more than enough for me right now, and hats off to the SuSE devs because a great deal of work has clearly gone into this.