I've often heard of Alliance players who get fed up with their fellow teammates for whatever reason, and decide to defect to the Horde. Perhaps they say the Alliance complains too much or seems too crowded, or even seems "less mature" somehow. But we've talked about that quite a lot already, and Horde players often say they have just as many maturity problems as Alliance has.
Yet I was still surprised to discover that one of my relatively new friends had actually defected from the Horde to the Alliance. As a roleplayer, apparently he felt that the Horde roleplayers kept on rehashing the same roleplay material, about death, trollish accents, and "strength and honor." I admit that my experience with my Horde hasn't been so in-depth, but so far I'm thoroughly enjoying my Horde characters, and I haven't had the same problem at all. In fact, it's my (limited) experience that Horde tend to complain least about their faction, in the same way that warlocks complain least about their class, though not at all with the same consistency.
Have you or someone you've known ever left the Horde and made new Alliance main characters? If so, why?