IMHO, the adulting of superheroes is what fucked them up. Adding the angst, the self-doubt, the self-loathing, etc. That's not shit kids can often relate to in a positive way. And many of the superheroes we have seem to have serious, untreated psychological disorders. The whole genre takes the very real issue of psychological issues and presents it in a largely negative way, creating the kind of stereotypes we can comfortably pigeonhole people into and call it "good".
Once superheroes became fodder for adults to be entertained by, they lost the heart and soul of what superheroes were supposed to be for kids. And for that, I won't forgive Marvel or DC for letting that happen.
