Not in a while, no. (I think the last time was when I had Fedora 11 on my Eee...early 2009, so some early KDE 4 version.) But KDE's standards are only good for KDE software. If you want something that isn't part of the KDE project, or that doesn't have a tweaked version available, then you're still stuck with the problem of using whatever the programmer happened to decide was "good enough" for a graphical frontend to whatever code they really wanted to be working on. The same goes for GNOME, for Unity, and so on and so forth; the whole problem with Linux usability is that it's little insular islands of standardization in a sea of "whatever."
And anyway, that still doesn't solve the problem of the underlying system just being too drat complex. A desktop OS just really should not be built out of forty years of cruft layered onto a mainframe OS from the '70s.
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