Take Metro etc. out (or, better, have it as an app launched from the desktop, and completely uninstallable), sort out the start menu and a few UI tweaks and they would have had an easy win on their hands, but their efforts to do things no one wants are causing them to fail, even to the point of giving people like Google an in with the latest Chrome for Metro aping a full screen Chrome OS like experience which, ironically, is more Windows 7 like than Win 8 is.
MS really need someone that understands not only what they're good at but why people have stuck with MS software at their helm.