Is all about tastes, Japan doesnt like games like COD, GoW, Assesins Creed, AAA games, western games, but instead is us the rest of the world who loves Japanese games.
I think is Japan has manage to make the rest of the world to love its games, but is the rest of the world who is not able to make them love their games.
Crash Bandicoot make by Naughty Dog is one western game that really impact the Japanese market when it realesed, after that no game has done the same impact.
I think is the west of gaming industry that hasnt figure out how to enter the Japanese market, like i said there are examples, but those are the exception.