The "Ribbon" is on the top of my hate list, along with Minivans, Windows 7 Libraries, interminable stoplights, the Democratic and Republican parties, every single Fortune 500 CEO, and people who write checks in grocery checkout lines.

I can never find anything I need, the ribbon structure is totally non-intuitive, and every time I open word (and I mean every time), I have to customize the ribbon in some way.
Once again Microsoft let developers run amok with no thought, absolutely no thought, to the user experience.
I would pay $100 for an app that converted every Office 2010 app to look and feel like pre-Office 2007.