I blame Joseph Campbell for ruining modern cinema with it's simplistic boring plots (like Star Wars's) where yet another hero battles some evil tyrant to save the world, universe or forest.
There are so many more interesting, surprising stories to be told that leave the viewer with unresolved things to think about and captivating cul-de-sacs along the way. The 1970s films were full of odd, interesting plots and films where it was unclear who the protagonist was (let alone a hero). Then Lucas discovered Campbell and made two pretty-good, unbelievably successful kids' films and modern cinema was born.
Now every film (especially kids' films) are a take on a James Bond plot whether they are about loveable zoo Creatures and cheeky penguins, toys in a nursery-school or talking cars: a super-villain, a secret base, a mysterious super-weapon… yawn
Grown-up films are no better: reduced to a sorry stream of infantilised garbage about super-heros who each in turn is given super-powers only to see them quickly taken away to provide some tension before a giant battle in which cities (and budgets) are destroyed for no good reason (accept perhaps to deliver a few half-decent one-liners) before a last-minute triumphant victory in a working steel-mill (if budget allows) or some disused warehouse if not.
sigh