Interesting, all of us think that lots of, should we say popular art ( and serious art), could be improved/changed.
Every time, we walk out of a cinema disappointed, we are, in fact, criticising some aspect of the film makers work ( e.g. the film was too long, the characters were two dimensional, the pacing was wrong etc).
Now, we can't change a film, or a book, or a play (well, maybe a local amateur production), but we might like to if we had the chance!