The kit zooms, 10-30 and 11-27.5, are respectable performers as far as optics go, however they tend to wear out quite quickly due to the internal components being of poor quality. When this happens the lens will cease to operate properly and often will stop exposing the pictures correctly, or lock up the camera. Sometimes this happens towards only for one end of the zooming range, until the lens just dies eventually.
I have seen similar with the 10-100 zooms as well, but not with the 6.7-13 zoom, the latter being a very snappy and solid performer. The fixed focals, 10/2.8, 18.5/1.8, and 32/1.2, are all good and have the metal lens mount.
It is really saddening that Nikon didn't keep better quality control with this line-up. The CX concept truly deserved better.