I think it looks cool and feels fresh. What's happened is that MS has finally put some people with design sensibilities in control, something Apple did years ago.
All you guys who think Windows should look like 1993 until the end of time, you have nothing to worry about., Just go to Ebay and spend your Social Security checks on some 386s running 3.11, and you'll have your comforting, familiar 3D edges on everything to keep you nice and oriented. Myself, I like what's new and different, just because. By the way, I've been in this since before DOS. Maybe I'm in that 'second childhood' I've been looking forward to.
I hope MS just tunes out all this noise and goes right ahead, and brings in a whole new generation of users who could care less about "Z-order".