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The default KDE theme is so pale and low contrast it actually looks as though the monitor is broken. The low-contrast idea seems to affect the whole of KDE; the app installer shows pale featureless grey blobs that seem to be application icons, and the explanations are given in a pale gray font on a white background; file browser tabs are pale, with a pale blue outline; icons are pale and featureless.
In short, I hated its look; I hoped Suse would be better than Kubuntu, but except for the wallpaper color, that is now green, the rest looks exactly the same. Alternative themes are so similar, (except for the dark ones, those DO have dark colours) that they make almost no difference.
As for the usability, I rate it down low. I hated the default menu, with panels that shift in and out of existence, and a hodgepodge of setup options smattered or repeated in unrelated menus. Discoverability of features is low; most things might be only four clicks away, but the whole universe and its parallels might lay thus far, for all the confusion that lies the way. And the way KDE forces its kool-talk lingo unto users is extremely irritating -- "Plasma Desktop Options", "Akonadi Settings", "Sticky notes Plasmoid", "Nepomuk has crashed"...
And SUSE not only would not install a proprietary nVidia driver, which for some frames of mind might be OK, but refused to believe that resolutions over 800x600 were possible using the free driver. Yeah, running sax2 from a console as a superuser let me reconfigure, but that is not exactly what usability is about.
I DO want to like KDE, and I am really giving it a try, but each time I boot I feel my heart shrink. It really has a VERY LONG way to go. Every 4.x version is expected to be the real one... maybe 4.4 witll be it?