Personally I like the Mac OS X interface, and my only complaint about it is that I would like to see more applications making better use of large screens, especially if this "full screen app" is going to become the next style wave to sweep interfaces.

For example making Chrome full screen stretches one tab across the entire width of my iMac screen, which is a stupid waste of space on most websites, and looks horrible on some websites which try to fluidly expand to the entire width of this huge screen. A better user of the horizontal space in Chrome would be to show multiple tabs side by side or even history, with the most recent page in a pane the far right, and the page that you came from in a pane to the left of that, the page before that in another pane to the left, etc.