I'm looking forward to the evaluation release of Blue coming out. I'm running Windows 8 on one of my laptops (Linux on the other two) and have liked it so much I bought a Surface RT and a Nokia Windows Phone 8.
I very much like the direction I see Windows going and look forward to seeing it evolve into something even better over the next few years.
The biggest hurdle I see for Windows now is the people who simply do not like change. They want something new, but they want it to be exactly like the old. Reminds me of the people who pissed and moaned when Ubuntu introduced Unity; the exact same comments about that as some are making about Metro (sorry, Modern UI).
I used Windows 7 part time, and only when I absolutely had to run an application without any Linux equivalent. With Windows 8 I actually enjoy it. The start screen, once set up to my needs and liking, is far faster and more efficient than digging through a start menu, and much cleaner looking than a desktop full of icons.
I also like the full screen apps. No wasted screen real estate. It looks very clean to me.
I also find Windows 8 runs faster, for me, than Windows 7 ever did, on the exact same machine (wiped 7 and installed 8).
But, everyone has their likes and dislikes. Personally, I like the new Windows.