That's right, Demon Hunters are a lot cheaper and deadly than Witch Doctors.

Smoke Screen is far more dangerous than Spirit Walk.

Impale is more dangerous than Haunt.

Smoke Screen can also break free of Hex, although i believe its bugged as it only works sometimes.

I'm a WD player, and i love my WD but having played with a DH in PvP as well, who i now favour... i believe the DH is best at PvP and the WD is NOT OP in this particular match up.