Contrary to the name, this list will include underworld areas if they're not dungeons. "Overworld" in this case basically means non-dungeon areas. The major legacy dungeons will get a separate list (hell if I try to rank all the catacombs and caves and whatnot).
I'll be ranking the overworld zones using the criteria of how atmospheric they are, how much fun they are, how much there is to do (i.e. how much they maximize their space), and how much I liked the overall layout.
