I use ALL versions of Windows (except ME) at work on various medical imaging modalities. I hate Windows 8. Yes, I HATE Eight.
I love Windows 7, and couldn't wait to dump the Vista abomination for it.
Before that, I have always like XP. I was a little put off by the registration crap if you changed components at first, but it is fairly painless.
Before that, Winders 2000 was a major step up from 98, which wasn't bad in it's time. 95 was slightly better than 3.1.
So there you go, I've recounted my opinions of all of Macro$ucks operating systems. No agenda, just honesty. Windows 8 sucks ass, and that's all there is to it.
And yes, at first, I hated it.
Now? I dont hate it, dont LOVE it either, but actually, as an OS, is is quite good, its the UI that needs tweaking. I do some of my own tweaks, and have found that I have gotten use to the lack of the "start" button. At the moment, operating this computer, compared with my Win 7 computes, is 99+% the same. So I have no real problems with it.
That said, when 8.1 comes out, I plan to upgrade.
So all in all, I give it, currently, a 7 out of 10 at the moment.