I've been using one all the way from level 1-55 on my Ranger so far, and the pitiful damage is really grating on me. Half the time I feel like it would barely matter if I just stood back and let my pet kill the enemy.
I know that it's intended more as a defensive weapon for the Ranger, but the damage is too pitiful to ever pull aggro from the pet, and the cooldown on the block and interrupt are also very excessive (higher than comparable skills on other professions). And even with that in mind, the replacement of potential offensive abilities with defensive ones already trades offense for defense, making any further reduction of damage on the existing attacks unnecessary.
Edited by Darklupine, 11 October 2012 - 03:30 PM.