I installed Win8 CE on my circa-2004 WinXP laptop (Pentium M 1.73, 2GB, 120GB), and it's brought new life to the computer. The laptop had become barely usable with WinXP, taking forever to boot up and even to load web pages. I don't do anything important on my laptop (heck, it barely worked anyway), but now I can say it's actually fun to use. It's just so quick - clearly, MS was aware that they needed to make the interface snappy given that it would be used on low-power tablets.
I have to say that for a simple "consumer" experience, Win8 really clicks, and I would absolutely love it on a touchscreen laptop. All that being said, I just don't think this works for power users. It takes forever to find certain administrator functions, and the buried shut down button is just laughable. And the desktop is still a necessary evil - for instance, the computer switches to the desktop when loading an application downloaded from within metro IE. To me this is an obvious sign that there are two interfaces embedded in one here - the desktop, and Metro.
Honestly, I want this to work. We all love the desktop and all, but does anyone actually realize how useless it is? I mean, why is it that we think it's ok to boot up a computer and get basically a blank screen? Desktop gadgets were a first step in the right direction, but I really like what MS is trying to do here. They didn't remove the start menu - they made the whole desktop the start menu.
By the way, two observations:
(1) does anyone see the similarity between this and "Active Desktop", Microsoft's failed attempt at an interactive desktop back in 1997? Link:
http://en.wikipedia.org/wiki/Active_Desktop
(2) does anyone see the irony in that Metro actually looks more like Windows 3.1 than Win7?