Crushthrough is fine. How often do you see anyone with a great maul topping the scoreboard? I remember Phyrex using one and topping the boards long ago, but he would do the same with his GGS.
Crushthrough is very effective to break stalemates with shielder clusterfucks, which is what it should be. Mauls arent overused or overpowered in anyway, if you think they are show me some screens.