Is sundering mace worth it 1hander?
It’s a little difficult to apply weakness using mace 1 (3rd strike) against a human opponent, so unless you have another plan to apply weakness (like warhorn), you might not see the 15% damage boost as often as you like. Mobs of course don’t dodge.
As for the cooldown reduction, you’re reducing the parry to about 8s and the daze to 12s, so if you find yourself depending on those skills, sure.
But the OH mace has some pretty nice abilities that shine with the CD reduction.
So the answer is definitely maybe.