It DOES run great though, but I think they'd do a good job by simplifying some aspects of it, too bad the community seems to be mostly opposed to that as they want KDE to remain a more power-user friendly desktop.
Regardless, I think once KDE is set up to one's workflow properly, it stays out of the way and can remain out of the way on new systems by transferring the config files. It just may take a lot of upfront work to get to that point and you can get easily distracted tweaking the minutiae over time. For that particular reason, I also prefer just using vanilla GNOME (with only the AppIndicator extension for DropBox and Steam tray icons). Granted, that's a "me problem" because I get easily distracted and can never stick with a specific setup when there's so many options available for me to tweak.
TL;DR: Both KDE and GNOME can be minimal, but the latter requires "minimal work" because it's minimal out-of-the-box and there's not much work that can be done.
Both work great and have all the features I need, but KDE feels a bit boring, a bit "Windows XP" while Gnome seems like a more modern desktop to me. I much prefer Gnome's dock to KDE's "start menu" with so many things cramed at the same place (well, like Windows).
(I don't use Linux anymore.)