I actually like Metro UI (for phone/tablet) ... it's horrible as a desktop UI, and the metro apps are pretty clunky.. but for a phone/tablet UI it's decent. Not as nice imho as even the WebOS' UI that Palm had done, which is still one of my favorite UIs for mobile devices, and Android and iOS have adopted some ideas from.
Forcing Metro on the desktop versions of windows, and even into the XBox UI was a pretty big error imho. It is passable on a touch screen laptop but still not great. To this day, I think that Windows7's UI is one of the best desktop interfaces I've seen. I like Unity, but it's still really rough in some respects, and the menu interface for it is really bad if you're actually clicking through, for super+search it's okay. OSX is okay as well, but finder has its' own warts for power users. I'm currently running Windows 8.1 for my desktop with ClassicShell over it, and that's not bad. My laptop is OSX and I run Ubuntu's Unity on a couple machines as well.
At least MS stopped trying to shove a desktop paradigm onto mobile users, now if only they could stop shoving the mobile UI to the desktop. I think that there are some really bright people at MS, but their management style has really hindered a lot of things over the years. That's now changing (somewhat) if only because they are now trying to adapt.