I am glad blizzard favors horde.
Alliance have been written as lawful good. Lawful good is one of the most boring alignments in all of gaming. The story is over written and well known for the lawful good types. It's predictable and worn out. An alliance centric story would be what exactly? A bunch of humans and elves doing something good for their people? What an interesting turn of events that would be, "rolls eyes."
The alliance needs the horde story for this game to remain interesting. It makes the game much more dynamic and much less lawful good vs. chaotic evil. Currently, we have greys and a mixture of alignments.
QQ moar or roll horde. It's a game, get over it. It's such a pathetic 1st world issue.