Originally posted by Shiny Ninetales
I think unedited overworlds never was a reject reason. Not sure if that's an implicit rule or something, but if it hasn't been revised it still shouldn't be a reject reason.
I still suggest you to follow Darolac's advice though, you can do a very basic overworld.
I checked and it seems it isn't. Even if it's not a reject reason, you can see that a ton of hack removal logs mention unedited OW and the need of having an original one, even if simple, so the advise still holds.