I'm responding to both our threads in this one for the sake of convenience. Just some final thoughts on the matter...
There seem to be two separate arguments running about in all the comments to the original post. One is that the Super Young Team don't act like Japanese people. I don't know enough to know whether that's true or not, but I think that type of argument is perfectly valid. This argument seems to be your major issue with the characters.
The other argument is that the Super Young Team don't act like the superheroes of Japanese fiction, which I don't find a valid argument. To me, that's like saying a unicorn's horn is the wrong length or that a real ogre wouldn't behave a certain way, or something like that.
Japanese people are real, so of course any story set in the real world or one very much like it, such as the DC universe, should strive to accurately depict them. Japanese superheroes are not real, and writers depicting have no such similar constraints. They can write them as Sentai heroes. They can write them as Liefeld-esque guys with millions of pouches and straps. They can write them as all telepathic. As all non-telepathic. They can write them as all gaining their powers from the same crashed alien vessel. They're all equally valid courses because it's all make-believe.