The metro UI is basically "Dumb as Rocks" mode, People were to stupid to click on Start and then go to programs that they starting putting everything on the desktop, then one day some one checked and saw they had over 100 and though, oh the "majority" of users (read the stupid ones) put everything on their desktop and dont even bother with the start button. I have no Touch screen, i dont want people touching my screens because i dont want oil from their skin on my screens, Why the heck do i want to have to clean my screen every 5 seconds when there is a another smudge on the screen. W8 will fail, because eventually everyone that watches porn will realize how bad a touch screen interface is for the "majority" of society that ultimatly decides what technology survives. maybe not at first but when all their equipment starts to fail they wont be using "touch based" for very much longer Let's just say that ten years from now you'll be as far behind the curve as you are now with Windows original tablet version. It seems Apple succeeded where Microsoft failed and now Microsoft is again trying to beat Apple to the punch. Hey, if you don't mind always being "second class", then stick to your old, boring, time-consuming habits.
10 years (but rather a lot earlier, still maybe 1-2 major releases) from now the hardware will maybe have evolved to the point where such an UI could make sense, but for now you (and MS) are missing one important point - we don't NEED touch on desktops and laptops!
Another very important factor wasn't mentioned - why do the apps only run fullscreen? That's not progress, the praised tablet and phone OSes are actually a huge step back necessitated by the much much weaker hardware. If we want to multitask in an efficient way in Win8 we have to go back to the "old, boring, time-consuming" desktop and use non-modern apps. Of course our Grandparents don't really need multitasking, but some of us have to do real WORK with Windows and we'll see how companies adopt Win8 for their workstations.
BTW argumenting with the price is like that old Monty Python sketch "I've been shopping" - "What did you buy?" - "A piston engine" - "What did you buy that for?" - "It was a bargain".