So, which country currently produces the best Major League talent?

I agree with you about Japan. I think the best MLBers come from the DR and the other Latin America countries. I mean look at some of the players that come from there.. Johan Santana, Bobby Abreu & Omar Vizquel *Venezula* Fransico Cordero, Nelson Cruz, Vlad Guerro, Edison Volzquez *DR* Roberto Clemente and Ivan Rodriguez for Puerto Rico etc...