That's really a great re-design concept. It looks really good without lacking functionality--I'd love to use that over Metro any day (especially after having used it in Windows 8 developer preview).
its interesting to see how we going back to basics. from windows 3.11 where there was like 256 colors through windows 95/XP more blurry, shadows, rounded stuff, through new windows design that just look "cleaner" and uses better matched color palette, but not much different from initials.
Imagine if you went to a website, and all the UI elements were pseudo-3D. It would look a mess.