Get over it. You sound like a bunch of luddites. It’s not for everyone just yet but I find it very useful in the tablet format and on a desktop touch tech monitor. The current presentation of tiles isn’t always the prettiest but pretty is for your car and trophy wife, not business use. Mozilla can pull their metro app, it wasn’t done that well anyway. I can always go to the desktop and use a regular FF icon, if I find a need to use FF. The metro look will morph into something more appealing for those who care about looks over usability (apple users) and after a while no one will question it anymore.
I heard the same themes and bitching when PCs went from DOS to Windows. Even today there are some I work with who believe that development and using apps is best done completely from the DOS prompt.
Classic shell works fine on 8.0, and its free.
It was however written by a Russian.