Metro lacks the user friendliness of a pet rock.
Learning curve is high enough that an old windows user like me (since the early 90s) can't figure out how to open an application or find where anything I have installed is.
No menus, no help, no interface, no organization, no context, no structure and too many ads.
I can't help anyone running windows 8. I can't find applications, documents, programs or interface. I'm not sure what that great scrolling walls of ads is, but it doesn't seem to relate to anything resembling functionality - it's easier to find an installed app using "google play" than it is to use that.
And forget "power user". I DO know how to open a command shell, and replace the scrolling wall of stupidity with a terrible second-rate wannabe menu that injects ads everywhere. (which is to say, pretty much every start menu replacement)
I don't actually -need- the start menu - the folders of windows 3 were actually more or less ok.
If I were running a tablet with this stupidity, it'd probably be tossed across the room.
It managed to build an interface almost as terrible and in your face as Ubuntu's "Unity". Except that it takes 50-90% of your CPU to run windows 8 and Unity only prevents you from using it.
I'm not sure who designed either system, but they should be kicked out of user design and forced to go back to school, perhaps in something useful like sales.