So yeah, after using it a few days, I've decided that Metro can basically die in a fire. Who decided it would be a good idea to have EVERYTHING be a fullscreen app?
No I don't want my e-mail to be a full 1650x1080; I like to be able to open multiple e-mail tabs (and regular tabs) at the same time without being stuck in any single one. No I don't want Skype to be the only thing I see when I'm making a call; I frequently need to look at other things while I'm talking, and I want to be able to mute or end a call from the taskbar without switching back over.
It seems like Metro is taking over for the kind of pathetic sidebar thing from Vista, except that instead of just hanging out on the side of the screen doing it's thing, it takes over the whole screen and won't let you do anything else. Technically, you can alt-tab back and forth, but Metro takes a good second or two longer than it should to pop up (it should take 0 seconds).
And it was indeed too hard to figure out just how to shut down the first time.
Otherwise, no real complaints.