The Horde went to shit when Crhistie Golden and Chris Metzen woke up one morning during Cataclysm and decided they couldn't be fucked to write a decent story because hey, making new villains for MoP raids is hard so this great Orc warrior is suddenly obsessed with magical artifacts and superweapons and the end of the world.
Even worse, the used this to force a short time travel multi-dimensional expansion story arc that should never have made it off the drawing board.
The lore guys certainly fucked up here.