I really like the look of the iron mace. Stab is the same thing as stabs on the great long axe/war axe and long maul. It's more of a surprise attack than a damaging offensive thing.
Would be nice if it gained a little more weight for more knockdown. As it is now, the bar mace comes too close to make that much of a difference. I can't remember the last time I saw someone using a long iron mace in-game.