Here's a scenario for you. A person on a plane working on a spreadsheet with their win8 tablet, as they later walk off of the plane and their tablet hits WiFi it silently syncs that spreadsheet to their SkyDrive (but to a section in their skydrive that other people have access to). As they wait for a ride they text one of those 'other' people to have a look/make changes to said spreadsheet. While they are being driven back to the office they receive a text that there have been some updates made to the spreadsheet. They view those updates on their windows phone (running MS Office) and are about to make some additional changes when the car arrives back at the office. They walk through the door into their office place their phone onto the desk and sit down at a Win8 desktop. Through the magic of Win8's superior SkyDrive integration there are but a few clicks and they are back in the very same spreadsheet they were viewing/editing on the plane, viewing/editing in the car without any additional hassle at all.
Yes the above can be achieved using other tech already available, but MS has worked at making it all even simpler. That they have achieved and I will be damned if I don't give them credit for doing so.
Sure the above may not be everyone's scenario........but come on.......you're simply discounting such an 'ease-of-use' scenario because you feel the following? "Fail number two, I have a phone, I use it as such. Allow me to use my computer as a computer.I don't see a need for those other devices."
For some of us it isn't even necessarily what we are 'doing' in METRO it in fact would be more of what we're not doing in METRO. For instance, using METRO there is no longer this insane drive to needlessly clutter the hell out of one's desktop. Metro makes it substantially simpler to get in and out of apps as well as efficiently multi-task (man do I love the side-by-side screen swipe to switch between two frequently switched between apps) instead of hitting that antiquated start-button like there is no tomorrow.
At the end of the day, to each their own. Just don't expect some of us to sit silently by while some of you choose not to accept that there are those who might not wait for innovation to kick them in the ass and would choose to change their computational ways, sometimes for something which is obviously better, but also sometimes just having a willingness to change and see where things can go. That is after all how we ended up using the computational tools most of us are currently using anyway.......