Metro will be a vast change in interface.. I doubt many PC users will give up the menu interface so easily.. even with android o/s there are menu buttons and the most intuitive way to get things done are to have the important utility icons on the home screen or secondary screens..
Sure, we should do away with drive letter nomenclature and things of that nature, but we still want to identify drives and manage them easily. As drive space increases exponentially, I dont' think Metro will be able to easily manage drives and arrays which will be 10, 15, 20 TB's.
I'm not a guinea pig, perhaps I will learn more & do some research before making broad conclusions about the interface, but I suspect it's not as robust as the windows PC's from 95 - "7"... And, in that regard.. the new O/S becomes more like dare I say it.. Apple PC O/S?!? WTF!! I don't care what name is on the brand, if you hollow out the interface and make it more Applesque, you're gonna push consumers into the arms of Google!! My appoligies in advance for this uneducated pre-conclusion if it's way off base..
Update: Win8 looks like a hybrid interface with Win7 backgrounded.. what I can see metro useful for is when you have a multiple screen setup.. Having Win7 in the default interface, and Metro running on a screen such as your HDTV even possibly in another room, which will be your access to your PC in every room of the house. These possiblites seem reasonable. However, I doubt people will touch their HDTV.. its more likely a tablet will be the remote interface of choice in the future. Google's arleady given us a taste of what is to come. No doubt M/S is leveraging that.. They will have to simply the PC startup screens and intitalization startup-- it's too clunky, IMO from what I've seen in youtube video demos.