Regardless of whether you agree with GN or not some of the commenters make good points and I wonder if MS in choosing style over substance arent making the sames mistake as New Coke.
The original Xerox vision was always multiple windows placed side by side and each program doing a specific task and program to program comunication. OSX was doing the besg job at this with a good amount of style to boot. Now with this new MUI you cant even launch a program without covering up the whole screen. Perhaps they should call it Curtains.