First off, I just read your downgrade doc from Microsoft. They would not have qualified under those guidelines even if we knew about them. I spent exactly half of one day on windows 8 and about put a bullet through my head. I had a hard time navigating it and every time I tried to do something, it threw up a screen full of tiles. Classic shell brought back the familiar look and feel and made the system bearable. Younger people may not have issues with learning new interfaces or adapting to new technologies, but some of us old farts don't like change and don't feel like we should have to.
Navigating what? A Full screen start menu that is completely able to be arranged and sorted EXACTLY how you want it? You can make the tiles any size, wide, large, medium, and small. You can sort them into columns. Hit the windows key again and it goes away. You gave it an entire day before you switched? Change takes time, I was frustrated about some things early on (8.0) like the restart function being hidden behind WIN+C. But they've fixed that in 8.1, as well as a host of other issues, like coming directly to the desktop instead of the start screen.
What did you try to do? Unless you hit the start menu, or try to launch a metro app, you'll never see the interface.
If my mother and father (60 and 70 respectively) who can barely use computers, can manage, I'm very positive anyone else can.