Crushtrough is a fun class to play, but it needs to be less accessable and powerful. It also needs better counters.
The same could be said of shielders: I see a lot of people going shielder nowadays and it has few counters. A dedicated shielder is impervious to arrows and bolts. They also have a massive advantage against 2h/polearm users; they don't have to manual (directional) block! This means that feinting is ridiculously easy, because they only need to think about the direction of their attack and don't need to worry about the direction of their opponents attack. With most shields they'll be as fast as a 2h/polearm user (usually faster; most shields except huscarl have close to 100 speed and the better 1h weapons have 97+ speed, while the better 2h have 92 speed) and don't really need to worry that they've got 20 less range - after all, how long does it take someone to close that 20 unit distance? It's barely enough for one well-timed swing, which is easily autoblocked.
Which brings me to my point: aside from throwing (well, sort of; with enough projectiles their shield breaks) and cav, shielders have only two other weaknesses; axes and crush through. An axe will take at least 4 or 5 swings to break a decent shield, which is usually played out as a swing while they're out of range and then the occasional lucky swing between their numerous, fast feints. Then, if you get that far, the shielder is now without their shield and are essentially a 2h (side sword has the same length of a katana, one less speed and similar damage) with full health, while you're down to whatever they've taken off already.
Crush through should force shielders to deshield (for fear of the crush through). As it is, crush through is only reliable with great maul vs shielders and only works against crap shielders. Any decent one can take out a maul user. An heirloomed bar mace works ok, but do we really have to retire just to have a chance against shielders?
I think the heirloomed +weight of crush through weapons should be removed. This will stop them being crap when unheirloomed and OP when heirloomed. Then, I think the formula for crush through should be altered; make it much less likely to crush through when someone blocks with a weapon, but much much more likely (with an unloomed bar mace) to crush through a shield. Either that, or simply make shields have as little HP as they did in native (where 2-3 hits with a heavy axe would break it).
The only problem with this is when a shielder puts their shield away when a crush through (slower, short length) weapon comes out, only to put it away as soon as a better weapon comes out. Oh well.
As it is, crush through seems about the only advantage to playing a 2h. Without it, 2h is outranged by cav, outranged (and outswung) by polearms, is shot up by ranged and is turtled to death by shielders (unless many 2h with axes gank a shielder, but I believe in balancing for 1v1).