I have dropped someone who has never used that classic shell into it. In fact, he has never really used a computer before. It's unbelieveably confusing for him. His laptop is Windows 8.1. It does not have touch screen. So, I cannot teach him the new Explorer, because he cannot swipe from the sides, and the mouse does different things depending on where he right-clicks. I added explorer to the taskbar in Deskop, and told him to use that. But then, there is no visible way to restart the computer og shut it down. While some of the metro apps (like Mail) would be good for him, they too are hard to use without swipes. Mixing the metro space with the desktop space is also terribly confusing.
The man is somewhat old, and new to computers, but he gets lost so fast on Windows 8 it's scary. I gave him an iPad, and he surfed. I can adapt, most users find that hard. If you are to push someone to adapt thus, it should be for great gain. I think the metro-desktop combination gives no such gain at present, and just serves to pull the otherwise excellent Windows 8 down. If they did not catch this is user testing, that is beyond my comprehention.
As good as metro is on tablets, it serves no real purpose on desktops and laptops other than a way to spread it, IMHO. So MS is sacrificing it's usability to gain a foothold in the tablet space. THAT appears to be working, but it made my friend struggle greatly with his first computer.