I did give Disrupt a shot and it's pretty good.  Not amazing, but pretty good.  With an Acc, it can reliably stun 2 or 3 out of 5 +2 minions.  Not all of them, but enough to warrant taking it.  Every so often a Lt will stun, but I can't tell if it stacking with Precise Strike, or if it stacking with itself on a 2nd pulse?  Not sure.  Maybe the stun could be longer, but honestly, it works pretty good w/o extra slots.  
 
	 
 
	 One caveat I have noticed though: It has a very small aura.  Mobs have to be in very close range melee.  I really notice the difference between this and my Tanker.