I'm not going near win8, looks horrible for a desktop PC to me. Looks designed for touchscreen tablets to me. I'll stick with win7 thanks m$.
This is misconception. It's not built just for touch. It's built for both, combination and things like kinect.
Desktop is there, it's still the same, task bar shortcut launch is still there.
As a desktop, all which has happened is the list text start menu has been replaced by a full screen, icon based live tile experience, which works well with keyboard+mouse. It's easy to use and you hardly have to see the metro start menu when using desktop. You'll only see metro as much aounce many times you oopen start menu in windows7.
On top of that you have a whole host of great features. Backup/refresh, snap screen, fast boot, general speed increase, live tiles(I like them, that's when we get some decent apps, I've always felt pc was behind compared to phones. Why do I need to open up/login to a program/website just to see if I have new emails and other information) and many others, refer to the features thread.
It's a great OS and many people seem to get stuck on metro, that if you really hate it, will be able to disable it through third party software, or just look at it as a full screen start menu. Which is how I currently use it. Once we start getting decent apps I can see me using it more and more. Again why go to a web address when I can just look at say a bbc news live tile and see a couple of news stories.
Now it's not a massive upgrade, but few window releases are, but if they do a £50 pre-order like last time. People would be silly to miss it, just because of metro. I've been gaming and web-browsing most of the morning and haven't seen metro once.