I can pull agro faster then a warrior or a warlock. Warlock dps is in long term. Warrior need to build up rage. I just need to hit 3 times and the agro is on me.
And warrior can get it back if i stop for a while
But if i crit 2 times in a row i would have to iceblock to get out of the agro.

But most of the time i let warrior hit for 3 sunders before i start.
And i am a Frost mage.