Yeah, they may nerf this, but I'm not sure you can use that video as a good indicator of how much they need to change it. Even in the arena portions, it seems they gave him time to stack buffs (no food or flask, but he shows almost two full rows of buffs in the arena portion) and build a full rage bar. I don't play a warrior so I don't know if that's easy to do or not, but when you stage a series of fights in order to get the highest damage numbers, it's not indicative of how things work in normal play.