But I do have Windows 8. I wouldn't say it's a bad OS overall, just unnecessarily mediocre.
The metro interface is goofy, and you DO have to use it for some things (for example, search, Netflix, some control panel options, and it's the default for viewing images, videos, etc. That last part is fixable, but its an unnecessary PITA.)
The upgrade process is broken.
Windows 8 also destroyed its boot sector somehow, and was generally useless at either repairing windows, or recovering the data on the drive. (To be fair, Windows 7 couldn't recover the data either, and I don't know that it was Windows 8 specifically that broke it or that its repair feature was any worse than Windows 7, but it's been a while since I'd hit such a drive error, and it only took windows 8 two months.)
So right now, I don't trust it, I don't like it, and it's not intuitive. I'd say those are pretty heavy marks against it.
On the upside, it does move pretty fast, and it seems to run lighter than XP (that could be bias, because it LOOKS like it should run faster). Its little compatibility tool is handy too. I plan to put it in a VM and use it to run Windows games. It seems the perfect choice for that. But it's not my first choice for my primary, workhorse OS.