In native (if this is a talk about native balance) crush is really not a factor. Morningstar and saranid maces will crush through a 1 handed weapon, but not if you are holding a shield.
The rhodok hammers are short and slow, but they are pretty dangerous right now. In the past, you could quite safely kick a guy who tried to overhead you and get back out of range, but it is a lot harder to land that kick now, which leaves you with weird swordwork people aren't used to. Spam swings work pretty well against them, but only if the great hammer guy is going for overhead attacks. You can be blocked, swing again, and still beat the great hammer's overhead. But if the great hammer uses a side swing you'll have to block, which will cause you a lot of stun and slow you down.
Well either way the hammer doesn't feel too op in this patch when I use it, though it is a lot more effective than the last patch, and if anything the success I'm seeing from using it this patch is because i'm defending on siege at a choke point. Also a lot of players there don't quite know about block crush or understand how to get away from it, so they are sort of paralyzed with a shield up as I donkey kong them 3 times in a row. But if anybody with at least some decent level of melee ability or knowledge gets close to me it is a lot of work to walk out of there alive using just the hammer.