You need a more specific context for your (broad) question. World of Warcraft was designed to emulate some of the events and politics that one would see in the real world. On the one hand, you have the Alliance and the Horde in a Cold War situation. At the same time, both factions will join forces when a crisis requires it. I've personally considered World of Warcraft to have mixture of good and evil ingame depending on one's perspective.