The director managed to make a fairly unexciting story to a something very watchable based on sound effects and weaving different time sequences into it. However, you probably need to know some history, science and politics to enjoy the film. In reality most moviegoers do not have that kind of knowledge. I have seen too many movies (esp of superheroes and latest Star Wars) where the best way to enjoy them is to leave your brain outside the cinema. It is a pleasant change because for Oppenheimer, you need to bring your brains into the cinema to enjoy it.