To me the QB sneak is not effective if they know you are going to do it, because they could do just that (overload the defensive line). If they know you running a sneak, than it's not a sneak. Put someone wide, and a running back in, so the defense doesn't know where it's coming. Also when the Patriots do it right - they line up quickly, before the defense has time to think, or bring in more lineman.
