This movie is a mishmash of ideas and misses the actual drama of Oppenheimer and his team building the bomb, The movie devolves into a movie-long legal deposition. Why? Who knows, it's Hollywood.
Americans somewhere between 1945 and 1948 developed a fear of the Soviet Union stealing our nuclear technology. Was Oppenheimer the real-world cause of this - no, Julius & Ethel Rosenberg had that honor and were executed in 1953 for this act of treason, so why spend more than 2 minutes on this? Answer because Hollywood wants to make the point there are Soviet Communists (they agree they are bad) and American Communists and they are mostly famous scientists and they accomplish great things, even though there is little truth to this theory.
The writer had little understanding of just how much those men feared building this unimaginable weapon with technology they could not be certain they could control. The movie touches on it, but without creating real drama or insights. James Cameron succeeded with Titanic by showing the audience the moral courage and cowardice that took place in the desperate last minutes of the ship sinking. It turned a wandering movie great and important.
This mishmash had so many opportunities to get to the real, actual dilemma the scientists must have been struggling with and just air brushes it away. This movie will not stand the test of time or of repeat watching.
It's boring for much of it. People we're supposed to know flow in and out of the shots and the characters make no contribution. A Senator bashes a witness and I assumed I was watching CNN and as a member of the audience you don't know why you're supposed to care.
If you read 1 page of the stealing of the nuclear secrets by the Rosenberg's before you see this movie, you will not understand what all the deposition questioning is about. The movie does not know or portray the actual public & government concern about blasting into the nuclear age that Oppenheimer's team brought to the world. The movie makes the assumption too many recent movies make and they assume the audience is ignorant and do not know the actual history.
You won't get the actual drama of entering the nuclear age from this movie. Hopefully you can find a pony of a plot somewhere in this mess.
The writer's plot was obvious and tedious and off the point.