Well, to be fair it's not like the entire Japanese league is able to come here & tear it up. That said, there's definitely talent over there that can compete at the MLB level. I think they impose a 9-year ban on leaving for the US too, so there could be some other players who fizzle before they get the chance to come here, but would have been able to compete during their peak window. Seems to me it's a pretty high grade of baseball in Japan.