Try that again with comic book movies.
The few good comic book movies were good because of their directors (Singer, Raimi... does Wong belong?), not because of their studios ("comic book movies make money, now? OK, let's do one of these things... what do we have?").
They barely get their own comic books right, what do you expect for a manga?
We know nothing of James Wong. For all we know, he could have been as big of a Dragon Ball fan growing up as Sam Raimi was a Spider-Man fan. We just don't know.
You made a valid point when you said that the execution of a comic book movie well done has always been in the hands of the director, not the benefactors. X-Men sunk in the hands of a hack like Ratner.
But to be honest, I hadn't considered Raimi for a Spider-Man director at the time of its filming. I, like everyone else, knew of him largely on the basis of the Evil Dead movies, plus the adaptation of A Simple Plan. Needless to say, The American Dream Gone Wrong: the Movie doesn't necessarily equate to "Spider-Man" for most people.
The only thing we can deduce from the idea of "great directors=great movie" is that
we know nothing. We are in no position to critique a director's competence armed with no knowledge of the person outside of which movies he's directed (it's not like he writes the script, you know). Which brings us back to square one: if given fifteen minutes, someone like me can come up with a moderately satisfying (albeit half-assed) interpretation, what makes you think the trained professionals can't?
You're missing the point entirely.