Didn't I already mention that peer-groups have similar interests all around the globe.
While the specific interests of Japanese kids might differ in some points, the global success of various Japanese products (specifically made for the Japanese market) like jrpgs, anime, manga, proves that they aren't that far off from what Western kids like.
Code Geass caters to EVERYONE, whatever you like, Code Geass has it. It has shota, loli, tits, ass, fabulous, drama, mecha, ... - the list goes on.
While its primary target are probably middle-school kids and fujoshi, the numbers of downloads and the interest on the internet alone should tell you that their concept works quite well.
Being made for the Japanese market does NOT eo ipso make it incompatible for other markets.