You aren't forced to use the Modern UI. You can simply login straight to the desktop and never see it.
I know ID, but what I mean is a Windows 7 GUI with absolutely none of the features of the Modern UI leftover, like moving the cursor to the right side of the screen and having that information bar or whatever it is pop up and a few other things.
I just don't want to see anything of Windows 8's Modern UI anywhere at all, especially in explorer windows. Maybe once some of the areas are skinnable, like the ribbon and status bar areas, I might like that area better.