Maybe we didn't realise they were flawed at fist glance. This could be because we just didn't have the knowledge to know that they were flawed when we consumed them.
Take the game The Last of Us, for instance: it's a total rip-off from a book/movie called The Road, and it makes absolutely no sense. In TLoU, they want to make Ellie undergo brain surgery, so they can reverse engineer her brain and make a vaccine for the fungus that turns people into zombies. Firstly, why would you like to make a vaccine, when 99% of the world is already dead or undead? Vaccines are a form of prevention, not cure. Secondly, you don't make vaccines for fungus, you just don't; there are other ways of dealing with funguses. Thirdly, you don't mess with someone's brain to make a vaccine: you just need to take a sample of their blood to study the plasma. But we all played this game and loved it, because 99,9% of us are not biologists/medics, and 99% of us didn't read/watch The Road.
Another example is Back to the Future. It's take on time travel is absurd, but we didn't know that at the time. Now we know about bootstraps and stuff, but who cares? It's still entertaining.
My last point is: bad movies are funny as hell. Did you watch The Room? Tokyo Gore Police? White Chicks? You should.
There's a manga called Chainsaw Man. In it, the protagonist is fighting the villain, and he asks her, "In your ideal world, there will still be crappy movies?"
"I don't understand your question," she answers. "But I think that a world without bad movies would be a better place."
He thinks for a bit, exhales, and finally says, "I guess I'll have to kill you, then."
