I don't mind windows 8, but I haven't really fallen in love with it. A few of my gripes:
1) 2 different interfaces, one of which is not very intuitive (pointing corners for everything)
2) Apps in metro don't translate well to the desktop. The only apps I find myself using are hulu/netlfix apps. In other cases, it's often a better experience to just browse to the equivalent website (ESPN being an example) or use the desktop counterpart for an app (skype).
3) Dual monitor support is strange. You can't stretch the metro interface to two monitors (though, there's not enough apps to make this valuable - see #2). You also can't force the metro UI to stay open when you click off to your secondary monitor.
4) Searching in metro requires more key strokes than searching in the windows 7 start menu.
5) What's the point of restricting random icons/programs from being placed on the taskbar? (Computer, being one of them)