I continue to hate the Ribbon UI. The biggest problem is that it is nearly impossible for the average user (even advanced, really) to customize for their own preferences.
I have the same gripe for pretty much everything that MS has done since WinXP. They decide what's the best thing to put on your menus for you instead of letting you do it yourself. I always disable "personalized menus" (which really is a misnomer) in windows and in office and everything else.
Don't treat me like an idiot. If I want stuff to disappear from my start menu, I'll uninstall it or bury it.