On a 24MP DSLR, I expect a little "mushiness" at 100% on screen - I think that it's the nature of the sensor with the sort of anti-aliasing filter they have; and most cameras look a bit soft at this sort of magnification. However, the output of the photos has been excellent in the "real world".
I think that the camera is pretty good (I have a number of other Nikons up to the D800) and I purchased it as a substitute for a "compact" camera. It has the usual little Nikon foibles such as upping the exposure a bit on a sunny day.
On the other hand, the focussing, while generally accurate, has at least one oddity - the camera doesn't focus all that well at wide-angle using phase-detection. For live-view, it's spot-on all the time. As the focal length gets longer, the focussing seems to improve. Also, there are certain lenses (eg 18-200) that it really doesn't like whiloe others (eg 16-85) go quite OK. Of all my Nikons, it's also probably the most temperamental in actually acquiting focus when conditions are a bit marginal.
Having said all that, the camera is eminently usable and, for me, is a way ahead of a large-sensor compact because of the rapid focussing and excellent sensor quality.
Nikon DSLRs, film cameras from Leica to Linhof