To the people saying horde wins 90% of the time in battlegrounds: L-****ing-O-L
My own experience is that alliance wins maybe 75%.
It's probably time for you to consider whether you're playing all that good yourself if your winrate is around 10%.
The true numbers probably go pretty close to 50 / 50 although you might experience something very different yourslf, but the truth is that it's just your subjective whiny-*** opinion.