Bruce Byfield reviews Ubuntu at LinuxPlanet and ….well….likes it but finds it lacking flexibility.
Read the stuff here
Some of the shortcomings mentioned here originate in GNOME itself. Yet Ubuntu has often changed GNOME to suit itself, so it must still take part of the blame. Ubuntu began with some promising improvements on the desktop, but for the last few releases, it seems to have neglected other changes that are just as much needed as the original ones.