At first glance, Warlocks seem to have a LOT in common with Sith Inquisitor from SWTOR. Selfish, greedy, arrogant. Will do anything to get power. Exploit it, use it for your own good, let others suffer if it will grant you power. Pretty much the polar opposite of a Paladin.
Lorewise, all we seem to hear about fel magic is, "It's bad, don't use it". We saw what happened to the Orcs and the Blood Elves - it seems like it would take a very rare individual to be able to wield demonic powers without being consumed by them.
So is it true that fel magic is WoW's version of the Dark Side of the Force? Or are playable Warlocks shown to have some degree of control over their nature/ability to resist its corruption?