Giant Jiggling Fanservice Batman!

[Jiro]

I figured the intended demographic was adolescents who liked robots, animated violence, and superpowers. Is that wrong?

It's not wrong, but you left out one integral part: Japanese. Their cultural influences are vastly different to those prevalent in your country and mine. There is a much more accepted interest in sexualised imagery; people read H-manga on the goddamn train for instance. That trout would never fly here, or in your country. You'd be arrested for something or other.