Originally Posted by
Raincrow
Honestly, I don't think it's a secret that the game favors Horde from a Lore perspective. Perhaps that's by design, because the history of the Horde is more eventful overall than the History of the Alliance. Additionally, a great deal of alliance lore is from the original WC series, which focused on both sides. Of course, that ended with the Alliance leader becoming one of the most powerful villains of all time and the Horde leader making his first steps towards the whole "Orc Messiah" thing.
I was having a discussion about faction leaders the other day, and it's pretty telling. Compare the world and quest impact of the leaders on both sides.
Horde has: Thrall (every quest on both sides should just have a cursory mention of Thrall at this point), Sylvanas, Vol'jin, Baine, Cairne, Garrosh.
Alliance has: Varian, Jaina, Velen....the dwarf guy, the gnome guy, the worgen guy....
Development-wise, a great deal of lore has gone into the conflict of the Horde, but in some ways, it makes sense. The Alliance is a strong singular force, mostly aligned under one guy, and the races all generally like each other and get along. The Horde is a hodge-podge of people who, in some cases, can't stand each other and yet fight so they don't all end up in Alliance concentration camps. Of course it will have more internal strife, intrigue, and outright warring than Alliance. And that means the leaders will be more defined as well.