Wow Insider on the Gear explosion
The scaling in gear in this expansion is huge. I recently felt the effects very keenly on my new level 80 Warrior, that attempted to tank some random heroics.
My Warrior is in quested green/blues, some BOE drops (blues) and some crafted epics (ilvl 200 level). Some of the raid-geared DPS had to scale back their DPS and it slowed down the heroic tremendously. Together with a Warrior that struggles maintaining AE threat, DPS was not able to AE to their MAX DPS.
I am queueing my warrior now as Arms-DPS for gear.