I think the biggest drawback is the lack of a ranking score. Almost every random internet player has been absolutely clueless about the rules of the game, not t

I think the biggest drawback is the lack of a ranking score. Almost every random internet player has been absolutely clueless about the rules of the game, not to mention the tactics. From a quick look at the GameKit docs, that seems to be a limitation of using (only) GameCenter to find players.