On Cairne US the ratio is balanced. There is actually 1% more Alliance, but Horde still kicks ass in BG's. In WG, it actually usually switches off. Horde wins, then doesn't bother to defend it, so Alliance takes it back, and then they don't bother to defend it, so Horde takes it back. It's not much fun to play though, since the fights are ALWAYS one sided. There is never even competition. So it's balanced, yet it never works out like it's supposed to. It's like a midnight 40 man raid on Darnassus.