try it sometime....what i do is completely ignore the weak mobs, cause, well...they are ignorable....when i have used storm to get to the next pack while the DPS is busy finishing off the last 1 or 2 of the last pack i can aoe the crap out of the next pack and build enough of a threat lead that the DPS cant hope to pull them off of me.
before i move to the next pack i toss off a taunt then move on...lather, rinse, repeat
its 10x as easy to hold aggro when you dont have to worry about DPS engaging .025 seconds after you attack