Berserk is a stunt. Gard has it in OW, so does the Lycanthrope Berserker on the Generic NPC thread.
I'm inclined to agree with UmbraLux about the way to approach this, but I am willing to stretch things up until about weapon 4. That's what I gave my Mythically Strong PC for throwing a car.
By the way Koffeykid, your example is actually all that hard. It involves a Superb skill, 7 refresh after discounts, a somewhat specialized situation, some quasi-legit stunt stacking, a -1 penalty to defence, and an inability to retreat. It isn't easy.
And on another note, I've been thinking lately about translating stuff from Exalted into DFRPG. It seems to be more or less impossible.