Wow, got to act 2 on inferno with my DH and it's tough as fuck. Even the normal mobs hit for insane amounts of damage, and as others have noted, elites can kill in one or two hits. My DH has 37k HP and 37k damage with sharpshooter. I've defeated 2 elite packs but died 6 times while fighting them. The fact that they gain the death touch if you take too long to kill them makes it almost pointless.

I might go farm act 1 but at this point I've completed the game 7 times so what's the point. Still, solid 150 hours of my life spent on this game.