I have no problem against crush through usually, I say nerf the whiners or start a tutorial server where they can go and learn how to play.
Crush through is only really at an advantage when you're funneled into a tight area forced to engage in a losing battle against the mighty overhead swing of a crush through weapon, if you're smart you wouldn't place yourself in that situation & if you're pro, you'll defeat your opponent in that situation.
Almost every map has different routes for flanking and other such purposes, you are not exactly FORCED to go 'trololololol' and walk into the short, slow, unbalanced overhead swing of a super slow str build.
NERF THE WHINE. it's not that hard to backpeddle and swing a long weapon, pretty much neutralizes most crush through weapons unless their user is an efficient manual blocker.
No offense to those having trouble but come on.