Although I have to (ugh) spend more time to get a real good impression, what I have tried of Windows 8 is terrible. The new interface is *Can'tSayThisOnTV*ing terrible. I can go from Windows XP to Windows 7, even to Windows 3.x and Android 3.x Honeycomb. I try Windows 8 and I have no *Can'tSayThisOnTV*ing idea how to use it. Interestingly, I have a similar problem with iOS- maybe there's a trend there. The new Metro UI is ugly, inflexible, and actually rather cumbersome to use. It basically throws away twenty years of interface development- it wouldn't be that hard to make Windows work for touch devices and still keep a similar look and feel. In addition, much of the OS feels disjointed and disconnected, like a file manager that feels separate (MAJOR step backwards) and two distinct environments. It's just a developer preview, but many of the issues are fundamental problems that won't be solved.
Which is a shame, since the core OS isn't bad. I am very much a hater of Windows 8, I'm sure others actually like it. While I will keep my opinion of those people to myself, I will say this. Windows 8 is definitely a Base Breaker- that is, very polarizing to its fanuserbase. I should also mention that although reception from tech sites has been largely positive, everyone I have talked to IRL that used Windows 8 hated it.