Two days ago I was helping some just dinged warrior cap arena 2s in my unholy spec. We met 2 warriors and I told him to stay in the starting room so they don't global him.
I have 67% resil + blood presence and commanding shout gave me 440k health.
One of the warriors had 385k health and the other one 345k - i killed them both in the middle of the arena in under 30 sec: unholy blight + death n decay glyphed + desecrated ground, it was like a circle of doom for them. They tried to charge me, stun me, fear me, all to no avail. They died to my necrotics and sour reapers with zero healing from second wind and diseases critting them for 20k
I don't think there are many classes in this game who can kill 2 warriors solo (1 of which better geared)
In short - unholy is fantastic!