Let's list my classes toolkits then, eh?
Ret: Bubble on a 5 minute CD. So, you can Deep 10x for every bubble I get. Nice stun defensive, right?
Windwalker: Even with Nimble Brew, 2 CC breaks on 2 minute CD's. You still get 2 Deeps that can't be defensived.
Boomkin: Barkskin. Every other Deep and I can't do anything about it. Barkskin won't even necessarily save you from death.
Hunter: Can't use any defensives during stun, there's web wrap, but thats going to be a minute CD. Still do fine against mages.
Point being, many classes in this game can't do SHIT against deep burst. Most of them especially are healers. BTW that scary "interrupt valley" ALWAYS exists against stupid fuckin mage blanket silence.
Seriously. Play a melee class for an hour in arena and you'd be on this side of the argument. Moar bias please.
Edit: In before FINE = HUNTERS ALWAYS WIN