Crush through is the anti-turtle, as a shielder they are my worst nightmare- and that's fine by me.
It makes you wonder why there's some weapon such as the axe with strange things called "bonus against shields".
Then again, if you remove thoses, it will be a pain to deal with the good blockers, since you just can't hit them, and they're too aware to get kicked. Crushthrough is the one solution when footwork/feinting/chamber blocking doesn't work.
If you make them disapear, the game won't be as interesting.
Oh, and btw, crushthorugh is a 2h, so he gets owned by range. With all the xbows i'm seeing now, i'm sure it's not much of a problem.