Really? I'd been under the impression I was the only KDE user left who actually liked the Oxygen widget theme. Everyone else seems to be cheerleading for the new look being shown off here (http://dot.kde.org/sites/dot.kde.org/files/plasma-main_0.jpg), which… uh… is the single lamest attempt to jump on the flat design bandwagon I've ever seen.
I find that image specifically to be a bit uninspired, but the other, more complete designs are actually pretty good IMO.
That said, I still like Oxygen, just not the taskbar design. I think they could have iterated on it and got a really really awesome and unique design. In there situation, I'd make the gradients a lot more subtle and smooth then work in more of the idea of lighting into the design. The icons could be abstracted a little more too.
I guess you can't please everyone.