Debian (Stable and Testing) are running GNOME 2.
My issues with Unity, as of Unity 5 (in Ubuntu 12.04):
1) Alt-tab should switch between windows within a workspace. This is HUGE. What is the point of workspaces if your navigation buttons/application launchers ignore the boundries?
2) Clicking on an application launcher should open a new instance of the program, not retrieve a window already open.
3) IF item 2 is to remain true, then the possible windows to re-focus should ONLY be the windows in the current workspace. See item 1.
4) Unity's taskbar should be movable to the bottom of the screen.
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Credit where it's due: Unity 5 allows resizing of the Unity bar, and you can now pin it to the desktop, so it's not constantly popping over the left side of the window when you try to close windows, access menus, etc.
One must still install gnome-tweak-tools to edit the font configuration and other things, which is inexcuseable.