I mean,that zone is probably the creepiest zone in WoW. The music,the environment and autumn atmosphere - that's just great. Also,those pig and crow people - I even didn't understand how they are made.
I haven't played through the Nazmir questline,but I suppose that's Horde's counterpart with all the swampy areas and evil trolls. The Stormsong also had a potential to be this creepy, Lovecraftian themed zone,but I guess we just needed a sunny area and it's fine by me.