At the risk of opening another Warcraft can of worms, I'll disagree because the Horde was/is generally "evil"; they were stereotypical villains up until Warcraft 3 when they became more sympathetic. In spite of that, the horde is for the most part the "bad guys" and the alliance the "good guys".
Naw, it's cool, and I'm sure we can keep the conversation civil.
The story was retconned in Warcraft 3 to be that the Orcs were enslaved against their will.
In the context of World of Warcraft, if there is a villainous player faction, the Alliance is by far the closest thing to them. While it is understandable for them to doubt the "The
Burning Legion made us do it" excuse the Horde now uses, if you put it in the context of the universe, where the Alliance has seen with their very eyes the Burning Legion...
The actions of the Alliance post third war, even prior to the introduction of Varian Wrynn, is outright genocidal. And unlike the genocide committed by the Horde in the first two wars, the Alliance is doing it completely of their own free will.
Now with the introduction of Varian Wrynn, who has been described by Blizzard as an "Anti-Thrall," especially after Blizzard has heavily pushed Thrall to be essentially a "Jesus Christ" figure for Azeroth, makes the primary leader of the Alliance nothing short of a pure villain.
EDIT: It's also worthy to note that almost every hero the Alliance had from the first three wars, have denounced the Alliance as foolish and racist, and joined a third party faction (such as the Argent Dawn), which works with the Horde. Edited, Jul 15th 2009 8:03pm by Karelyn