I noticed while using my Warhammer that it's damage really isn't that great even with +3 and ps6 and wm7 (all in 1h).
For example I have noted many many times hitting an un-helmeted target in the head and not producing a kill. Now I'm not saying that it should 1shot everything left and right, but its rather disappointing when you hit someone in the head with a Mighty Warhammer with no helmet and they still walk around.
With the changes to armour it would appear that Warhammer has rather lost it's core use, being able to interrupt and severely damage heavily armoured targets and disrupt enemy ranks.
Since lower classes of weapons can now interrupt heavily armoured targets its no longer the ideal weapon for heavy enemies anymore. Being extremely short, and slow (not gaining bonus to speed from heirloom) its only saving grace is the higher chance of knock down (3 - 3.5 weight).
Other weapons like the Military Pick and Battle Axes produce better damage, speed, range, and still interrupt effectively (No stab I know).
I don't really know what to do to put Warhammer back into the useful weapons department so I leave it open to all.
Please post useful criticism and not just say L2P.