Eeehhh it's still in early stages. Wouldn't say that yet. He's made like 5 of these America faction RPs, and only one of them wasn't a flop.
My reason in saying a custom map is because it sorta adds to the spirit of the nation RP appeal of being thrown into unique situations. Usually this deals with solely interaction with other parties, but with a custom map, this means new challenges and opportunities. I think as geography buffs, we're all pretty knowledgeable on what land claims are favorable and paramount for control in the real world. With a new map, it changes that, and it gives even more competition to control land because of less certainty. More competition == more activity.
And I would like to add, the rules of war? Redefined.