Polearms stun
2h stabs are magic
Shielders swing like hummingbirds fly
Tweaking is fine but changing this setup dramatically would require rebalancing the whole set. I agree with Saul that gameplay should be deeper rather than more shallow, but it's unfortunate when deeply skilled players can walk over less skilled players because they use some rather absurd weapon mechanics. The 2h stab, for example, continues well after the sword has actually stopped stabbing. Rather than just being powerful, it's also magical. The polearm stun, too, can allow chains of hits with very powerful weapons (cp: Bec). And some 1h swings, even when burdened by a shield, can come become almost unblockable unless one is reading what the shielder is going to do (cp: Matey ಠ_ಠ).
It's in these crazy cases, which are mostly weapon-specific, that we should be tweaking. IMO threads about "Fixing 2h stab" mistake the problem for a problem of weapon kind, rather than of specific case.