I found the movie incredibly boring. I think one has to be an expert in History to understand this movie, so many conversations just flew over my head. I could not comprehend most conversations as most were focused on his communist connections which seemed irrelevant imo.
I though this movie would be focusing about the race against Germany creating their own bomb, like they raced against deciphering the code in 'The Imitation Game', but instead this movie felt like the story was taken from the notes of the lawyer with some parts added about the A-bomb.
The 30 second scene of the bomb going off was visually great but was also exaggerated.
All these are just my views of the movie. If you liked it, good for you.