Oppenheimer is long and boring, editing is confusing mixing 3 periods, that sometimes you don't recognize, which is before which one.

I was misleaded by the trailer about what would come in the movie, Robert Downey Jr is difficult to recognize at first, but is playing well as a 2nd role.

I would preferably recommend to the people interested by "Project Manhattan", the movie "Fat Man and Little Boy "Les Maîtres de l'Ombre" from Roland Joffé, which will learn you more about scientific details than "Oppenheimer" which is more a biopic and take too much time on political theater against communism, which much too long unuseful dialogs.