Fail.
Thank you for starting your post so intelligently.
Of course you stand a chance (not in tight places though), but certainly not with spamming. Take a look at this :
Bar Mace
spd rtng 92
Mallet
spd rtng 84
(these values need roughly -8 nerf imho, same for other crushthrough/knockdown weapons)
Er...OK...is that meant to make me think that I'm wrong? Those are, indeed, the stats of two weapons. Great.
Let's say you are have a balanced char. Any decent 2h stacker will easily hit faster than you (quite strange since he has less strenght he should have more difficulties with using his weapon).
WHAT!? Are you insane?? I play both a 2h and a 1h (and basically every other build except HA) and I can say for certain that a 2h, regardless of how much agi they've stacked (can't be a huge amount if they're using a maul) they can NOT swing faster than someone using a sword (unless that person has no strength nor WPF).
The burrick style player however will not be faster than you, but still is fast enough to make it impossible for you to spam unless you have so high agi and low str that yes you can spam but it bounces on his armor and he crushes you.
This is still not the case. My 2h has 21 agi; I can get hit on a 1h turtling with a huscarl, but I cannot reliably get hits in on someone using no shield (I can occasionally if they have crap footwork or are generally retarde at melee without a shield). The same is true for my 1h (only level 22 as well!); if I try to turtle against someone who's using a maul, I die (unless they're pure strength) - as soon as I get rid of the shield I can spam them and outmanoeuvre them.
And I didn't even mentioned anyone can perfectly block like a jedi master with a big chunk of iron like the bar mace, long maul, great maul...
What? Somehow having a big weapon makes blocking easier?? It certainly doesn't make it harder, but it doesn't make it easier at all. I have a feeling that what you're noticing is a bunch of frustrated decent 2hers get out a maul to crack your turtle shell. They can't block better because of the weapon - they can block better because they're better.
Seriously, try playing as the class you're bitching about before you bitch about it. It seems the issue here is solely a lack of skill, rather than an OP weapon. I have yet to meet a mauler that my 1h cannot easily defeat. I actually look forward to them; they're a lot less dangerous than throwers. Drop the shield and L2P.
Edit: BTW, the barmace will crush through most shields reasonably frequently if the user has highish str. Use a weapon to block and you'll find they don't crush through very often at all (unless it is heirloomed; I believe heirloomed barmace is OP), especially if your weapon has some weight to it. The calculation for crush through means that shields are easier to crush through than weapons. This is a design decision - how else are 2h meant to have the advantage over shielders (or are they supposed to be effective against nothing?) if they can't get through the shields in some way?
I'm specifically talking about the great maul. The mallets don't crush through that often (with a weapon block) unless the user has high str, in which case they can be spammed. Regardless, footwork takes care of them.