Blizzard increased the HP of mobs sometime during the beta. From their post of the subject it sounded like it was a max level thing only. But they might just have slapped a 2x modifier on every mob and called it a day.
No, you don’t have that much more damage now. It’s a slog killing mobs. It just took me 1 minute and 15 seconds to kill two mobs.
Just counted how many casts it would take to kill one of the mobs I was fighting at the revendreth calling area - I had to cast 37 times before the mob died. 37 casts for a world mob.