There exists an interesting theory concerning gamer preference of good vs. evil. It is said that in World of Warcraft, as in many other games, the "good" seems to be the most popular choice. Most people want to be the pretty human character, save the princess and become the hero.
Enter Warhammer Online, where the majority of players have flocked to the Destruction side. This isn't simply the 'darker' side, this is the burn-down-your-house evil side. This is the stuff-a-dwarf-in-a-barrel-and-toss-him-off-a-castle-wall evil side. So why do players relate more to this type of bad guy persona? Relmstein has some theories about this over at his blog, which include the fact that Mythic focused much of their hype on the Destruction side.