Some people who play World of Warcraft really closely identify with one of the two factions, the Horde and the Alliance. They care about the ongoing lore of the divide, they argue back and forth about which side is in the wrong and who is doing what, or when which side committed a particular wrong or another. Now, we here at wow.com are no different in that regard, as you saw when you followed those links. We're passionate about the game, and that includes the lore.
However, I've always been less a factional player (I have and love Horde and Alliance toons pretty equally, and I think both sides of the Horde/Alliance enmity have good and bad points) and more of a class partisan. I pretty much love shamans and warriors and don't really like playing other classes. I'll defend my chosen classes, gush about them, rant about what I think needs fixing, and play those classes to the exclusion of others even when I know that objectively those other classes might well be just as much fun. I just can't bring myself to support other classes, play them, or even in my heart embrace them as fully as shamans and warriors. I'm not pretending my behavior is anything more than the strange mental quirk of a particular player, but it got me wondering: what other strange divisions are out there in active play? My lovely wife, for example, won't tame a pet unless it has a unique skin or is harder than normal to get. She just loves the challenge.
Do you find youself making a choice, whether it be Horde vs. Alliance, a specific class, a race, a profession, or a style of play that draws a solid line of demarcation for you in game? Roleplayers vs. non-Roleplayers? Will you only raid 10 man? Are you a partisan for PvP and barely even bother with instances? What do you cleave to in WoW, and what do you reject?