I have a Nexus 7 and Android seems to work well on it. It isn't my PC, nor would I ever want it to be. Typing on it in any significant way is a pain. I guess I could get a Bluetooth keyboard for it if I really wanted to, but I think I'd rather get a TI keyboard for my TI-89 calculator to program it (seriously)...
Point being, I don't see any legitimate (my opinion based on my preferences and needs) reason to use Windows 8 on my PC, since I don't want my PC to have the look and feel of a tablet, and my tablet wouldn't function easily if it had the same GUI as my Windows 7 PC (otherwise that is what I'd prefer).
So, aside from the PC user unfriendly GUI of Windows 8 and the social networking (engineering) stuff which I don't care for anyway (yes, I don't even have a FB account), is there any reason to get Windows 8? Maybe they'll encourage software developers to use a newer version of DirectX that isn't available in 7, or similar?
I personally hope not.
By the way, I have my own "cloud," which I use as I see fit, so no need for that either.
My personal critique aside, is there anything that you can do with Windows 8 that you can't with Windows 7, and if not, how likely do you think it is that there will be (before Windows 9 is out [Maybe I'll like that one more.])?