Other than the minor video problem that Nikon just fixed, I've had no trouble at all with the D7000. I'm not yet getting the kind of shots that I got with the D90, but that's because I haven't developed a feel for my new tools. I suspect you'd go through the same thing with either camera. Whichever you choose, you'll have to read the manual and learn the layout.
My opinion after 30 days: The D7000 is excellent. It was worth the money and improves on the D90 in both big and small ways.