The main complaint about win8 is usability. About how it is has what was called the Metro interface, designed for touch, on desktops. That it hides controls etc.
It's great you like it and that is good and I imagine as a power user you can find all the controls, and do away with Metro etc.
Here's what Neilson has to say:
http://www.useit.com/alertbox/windows-8.html