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The ribbon UI looks great but after the good look, I do not find it quite usable for several reasons:
1. The people used to know the old menu and the functionality it provided. When Office 2007 was released, everybody had to learn where everything was relocated.
2. The excuse: "everything is contextual and organizated by functionality" is due to the bad organization in the pre-2007 Office menu... the menus should contain everything organizated by functionality too!
3. All applications have File | Edit | View options and everybody knows where their things are and what's their functionality. I do not see why removing such very standard menus to other places.
4. They also replace the hot keys to new ones! That's unforgiven!! Edited 2008-10-13 16:36 UTC