If there is one thing I do not like about Ubuntu, or better still, that irritates me about the project, it is the frequency with which things keep changing on the GUI front. Heck, seems every release has a learning curve in terms of GUI!
And come April 29, Lucid is not going to break from the tradition of GUI interface inconsistency. I think this is just getting way too much. Yes there should be some change along the line, but that should not mean change of familiarity all the time.
In the screenshots of the upcoming default themes, the lower panel has been removed. Why was it removed? Sure the themes look really cool, even if they are distant cousins to the Mac OSX, but to have moved the window buttons to the left and taken out the lower panel in my view is just not necessary.
I stand for change and innovation, but not at the expense of breaking down familiarity and having people relearn new things all the time. I hope Lucid is going to mark the end of changing the UI of Ubuntu almost every release cycle.