Have to agree with Rob too, there are actually useful things in Windows 8, like the fact Explorer is approaching Win XP functionality again (removing the status bar so you can see how much disk space a folder takes up, really Microsoft, what the hell were you thinking?). Task-manager redesign, showing more information so I can better diagnose the process hogging the system or thrashing the hard drive.
I know why it's putting the infuriating 'Ribbon' interface on Explorer, to make it more touch friendly. Doesn't mean I need to like it though, not that it makes a huge difference since most of my actions are right-click based.
The Metro start menu and general interface (like the hidden UI features) will take time to adjust, I'm sure of it. I still haven't gotten around to actually using it though, but we'll see. But there is a lot going for it in other areas, like multi-monitor support, various architectural improvements and the like.
The problem is, Windows 8 feels more like a paid-for upgrade than a brand new OS - once you remove Metro. Without Metro, there really isn't a whole lot going on, but I guess the same could be said for Vista and 7. The funny thing is, the upgrade price reflects this. That and they're taking another page from the big book of Apple, reaffirmed by the release of its own upcoming hardware (just so long as its tablets weren't designed by the same peeps that did the 360 when it comes to failure rates...)