AiP is good, but it doesn’t really have much of a plot - it just meanders from one musical number to another. SitR, OTOH, is tight and funny; in fact, it would work as a classic Hollywood screwball comedy even if it weren’t a musical. That’s what makes it the better film, IMHO.
I love Real Genius, and I think it generally holds up well (I watched it again within the last month or so).
Where I could see some people having issues with it is in objectification of women. While Jordan is an excellent character, and has her own story and agency, the other primary women in the movie are:
Sherry Nugil, whose role is to have sex with the smartest men in the world
Susan, the “can you pound a six-inch spike through a board with your penis?” girl
It’s seen as sexist by many people today. Molly Ringwald has spoken about how the movie hasn’t aged well, particularly how her character was treated by Judd Nelson’s character.
I searched the thread. Harry Potter hasn’t been mentioned.
The first film is accessible to almost any audience. Harry Potter and the Philosopher’s Stone has a sense of wonderment that is captured in the children. The audience is introduced into a alternate world that is very unique.
Harry Potter and the Order of the Phoenix is my favorite. It requires some knowledge from the earlier films to fully understand the story. A sharp viewer can figure it out.
They are good films that are enjoyed by children and adults.
I think that’s what the OP asked for? Good films that aren’t considered great.