I had Windows 8 on my system, the cheap upgrade offer from Microsoft was hard to resist but I'm back on Windows 7 now. In another year with more app support I'm sure it will be a much better prospect for me. Perhaps when there are more Metro integrated apps for everyday used services like Steam, Origin, Teamspeak etc then I might use it more. Right now if you install it you'll spend 95% or more of your time booting into the metro interface then clicking to go to desktop - or pressing the Windows key, whichever additional unwanted extra step to do anything useful in Windows 8 you prefer

even for Internet browsing I preferred to drop to desktop to use IE 10 rather than the awful Metro version. All non metro supported apps drop you to desktop but with no Start button it feels restricted - just as Microsoft like it. For al their talk of user choice and freedom to customise and do things with Windows 8 you can only work in the tight confines Microsoft allow. By taking away the start menu and not giving you a built in option to boot to desktop they are enforcing the metro interface on the user. If Metro is so good,so fun to use, so intuitive then surely you wouldn't need to force it on the user?
If you're using XP or Vista then I'd suggest upgrading to Windows 8. If you're a Windows 7 user thank your blessings and hug your installation disk