The Ribbon is an eye-candy solution to a problem that only existed in focus groups. Microsoft may have been legitimately worried that OpenOffice and others were encroaching on its turf, productivity apps increasingly looking the same, and wanted something to look new and different. And that's fine, but they made it mandatory, and also yanked the menus and other, customizable interfaces people had gotten used to for getting their work done.
Seriously, a very important feature of Microsoft products was the ability to customize them to a particular job or work environment. That's one way businesses got locked into Microsoft.
The ribbon shot that in the foot at the expense of precious screen space. Shills and trolls just say "learn something new". Thousands of offices still using Office 2003 respond "we're real productive with what we've got, and don't have down-time to gamble on something new." Microsoft has it backward. You don't fish for one or two consumers who want a pretty ribbon to buy one license... you cater to what businesses need, and sell site-licenses at tens, hundreds, thousands of seats at a time. Then, the consumer will buy a copy because that's what he or she trained on at work.
But that's Office. Sticking the ribbon into the File/Windows Explorer is just weird, like an attempt to brand everything in some effort to evangelize one-interface-to-rule-them-all, as if putting it everywhere is going to make people like it. I'm hoping Microsoft is gonna stop forcing it's homegrown ideas down people's throats, and get back to making software people actually want to use to get work done. Clue: busy people don't have time to participate in focus groups.