Well, I can literally tell you what it was like being a kid. I
never wanted to read Justice League Adventures because it was a throwaway Happy Meal type comic and cheap. It had no continuity with anything and was just a waste of time. I would want to read "the real" Justice League comic despite it not resembling my favorite show where as the Justice League Adventures did. I was able to discern that one seemed dumbed down and didn't seem to have much effort put into it. Besides, the adventures were mostly one and done throw aways that left me feeling empty. Nothing of substance. Had it been as good as the cartoon it was based on (which wasn't dumbed down at all), that would be a different story, but it clearly wasn't.
What I
wanted to happen was for the "real" Justice League comic to resemble my favorite show more, but done with the level of effort and ability as "the real" Justice League comic. By the way, I never really got what I wanted. EVER. Typical with me and DC Comics