Originally Posted by
Caerule
Weeeell, Demon Hunters take things a lot further than most classes. I doubt Paladins and Light priests would get along better.
A Shadow Priest indulges into territories dangerous to the mind, to draw in power. But those that fail to keep their minds functional for normal society don't find themselves with the Horde for long.
The same goes for Warlocks. To be a warlock is a constant mental struggle. Fail to resist the demons, and soon you won't be the master, but the pawn. Fail to control your power, and the fel you wield will change your body and mind, tainted to demonic features.
The struggle of the Death Knight is perhaps the most similar. They hunger for violence the way Demon Hunters hunger for fel energies. They walk a path of darkness for the greater good. The main difference is that Death Knights had no choice in becoming the way they are.
Demon Hunters willingly chose the path to mutate themselves, in return for the gifts that come along with it. They may struggle to resist their urges. But they are perhaps the darkest individuals so far, to be accepted as members of the Horde and Alliance.