Even something as simple and dumb as "a mine takes out one of the tracks and then you snipe any motherfucker dumb enough to get out and fix it". Once your tank is immobile, it becomes a pillbox. Your tank can't now get the fuck out of a situation at 80MPH, so a couple of jackasses with a crowbar and a couple grenades can take your tank out pretty damn easy.

Anti tank warfare has LARGELY not changed since WWII. The tech has gotten better, but the tactics pretty much remain the same.