The thing about wish fulfillment fantasies that is useful is that they define what people's wishes are. This is why they're important, though not exclusively so. What's a problem is junk, same as always, in every medium and genre; junk and just not trying.
Sigh. Remember the days when indie and mainstream comics both prospered in the same stores? I think it was called the effing 80s.
But. Another thing to consider about Superman. As Batman is driven, as Waid observed, not by revenge but by a desire to never see anyone again die like his parents, so, Superman is driven by the fact that he survived. That he was saved. So, given his abilities, he is worthless if he does not love, and try to save, everyone.