You don't have to use any Metro apps if you don't want to, and 10 brings back the start menu. If that's still to "Metro" for you you can install something like Classic Start.
Windows 10 brings back a Metro start menu. Initially, it was just bad, but better than Windows 8. The last updated made it much more like Windows 8. They really just don't get it at all.
In Windows 8, the wifi connect menu is metro style, and it's frustrating. Reason enough to switch to Debian.