I've sniped both enemy AP and AT mines before, that enemy players and armor were sitting right on top of. Fun times. As Jes pointed out, they can work both ways.
the only problem (fixed) with mines was when you can put it inside safe zone ... now i don't see what's the problem if i want put near capture points or in an useless point.
Actually with the new nanite system in place this is a completely moot point since you can now only stock 2 proximity mines at a time.
