When a Christopher Nolan film opens, you can count on a fan base to show up, regardless of the subject matter. Nolan has established himself as the preeminent film director of the last fifteen years. Ever since "The Dark Knight", film fans have looked forward to a film with his name attached, regardless of the acting talent involved. His technical excellence, commitment to film and theatrical presentation and his intricately plotted films have given him a reputation deserving of respect. That said, there is such a thing as overhyping a film, and that is exactly the defect that I had with this movie.
“OPPENHEIMER. The best, most important film of this century. If you see one film in cinemas this year it should be Oppenheimer. I’m not a Nolan groupie but this one blows the doors off the hinges,” wrote Paul Schrader. This sort of statement will raise expectations beyond reason, and should be a flag that the writer has an agenda in his praise. My guess is that the subject of the first Atomic Bomb and the impact that achievement had on subsequent weapons development, is what generates this type of enthusiasm. Look, no advocates a nuclear war. Everyone recognizes the dangers to the planet should such an event occur. This has not been a secret for the last 78 years. So a movie that warns us of those dangers, is not groundbreaking, and how important it is depends a great deal on what issues matter to you personally. Writer/Director Paul Schrader has tipped his hand at what he sees as critical, I don't know that the film lives up to that standard.
None of the reservations I have expressed so far are intended to suggest the movie is unworthy, quite the contrary, it is an excellent historical biography about a misunderstood giant of science from the last century. You should certainly go and see it, just tame your ambitions for the film to a practical level and focus on the film making and story telling. The people who are writing about how gut punched they were by this movie, must not have seen a Cold War Thriller in the last fifty years. "Nuclear War=Bad" , got it.
Nolan's films are famous for the use of time manipulation to tell the story. In this film, there is the smallest amount of that approach in any of his films since "Insomnia". There are black and white segments that distinguish timelines in the story from the vivid color sequences, but it is more a technique for indicating flashbacks and flash forwards than it is for advancing the plot. The plot of the movie is basically the rise and fall of Robert Oppenheimer. This is surely a valid project because Oppenheimer was indeed a critical figure in science and the key figure of the Manhattan Project, which developed the first atomic bomb. His complex life lead to his successes and ultimate embarrassment in being denied an extension of his security clearance, in spite of his service in creating the bomb.
The first third of the film is a long recap of his academic and personal quagmires. Many of the incidents are relevant to later criticism of him, but as a film subject, they feel like they are slowing our progress to the subject of the Manhattan Project itself. As a biography, these segments are acceptable, but the film is sold in part as a thriller concerning the development of the weapon, and that part of the story takes a long time to arrive on screen. The time at Los Alamos is the most effective act in the film. This is where Nolan's expertise with visuals seems key to the movies success. Seeing the film in the large screen IMAX format with the XD enhancements, made the audience feel like they were there with the other observers at Trinity. The sound design is outstanding and the visual largely eschew CGI in favor of more practical effects.
Other than the weapon itself, the two hearings that bracket the story, provide the fireworks for the plot. Lewis Strauss, from the Atomic Energy Commission, becomes an antagonist to Oppenheimer, and his plotting to deny the security clearance produces blowback several years later in his own hearings when nominated to be in Eisenhower's Cabinet. It is the crossing of these two men's paths that sustains the film since we largely are familiar with the bombs results. The drama surrounding Oppenheimer takes place in the early fifties and the Strauss confirmation hearings were in the late part of the decade.
Cillian Murphy is Oppenheimer personified, with his thin and tall build he is a physical match for the scientist. The makeup team does a terrific job helping him play a character that moves across thirty years of time. His youthful gaunt looks in the early years are echoed by a more skeletal visage in his later life. Murphy has a way of speaking that sounds authoritative, cocky, and inquisitive. The one time that it is suggested that Oppenheimer was showing off was when he demeans Strauss's reservations about sharing isotopes with a friendly country. Otherwise, Murphy plays him as respectful of other physicists and intellectuals, although in private he could be dismissive. The personal moments are the least clear in the film. He has a passionate affair with Jean Tatlock, played by Florence Pugh, but other than their physical connection, it was had to see how these two triggered one another. Oppenheimer's wife is played by Emily Blunt, and she is seen as a fragile woman with deep problems, but one who is fiercely committed to her husband and his legacy. Her best scenes are in the hearings where she listens to derogatory information about her husband and she looks like she wants to stab the people testifying, without having to move. 
The cast is packed, and I won't take time to salute everyone who probably deserves it, but there are two other performances that stand out. Matt Damon, in a second film this year (Air being the first) is terrific as Leslie Groves, the military commander in charge of the project. He has to be persuasive, belligerent, patient and intelligent in a lot of sequences in the film, and he nails it every time. If I were taking bets on the Academy Awards for the year, I'd put a large wager down on Robert Downey Jr. for supporting actor. I literally did not recognize him in the film, I did not even know he was in it until the credits rolled. As Lewis Strauss, he is venal, powerful and ridged in his persona. The conniving scheme may be an exaggeration of the real events, but Downey Jr. sells us on Strauss as a villain, at least in regard to his dealings with Oppenheimer. Nolan as writer/director and Downy combine to make an accomplished man with insecurity issues, feel like a vindictive bureaucrat with petty personal animus toward Oppenheimer.
So the film is overlong, over praised, but still a great achievement. Like his other films, especially "Interstellar" and "Inception", Nolan is showing off his intellectual credentials a bit, but it would not be undeserved. He has clearly put in the work to understand the basic physics of the atomic process, as well as the political landscape of Washington D.C. . The movie could have been as compelling as "Dunkirk" was, if we had a little more story devoted to the competition with the Nazi group that the Manhattan Project was trying to catch up to and beat, instead of the personal drama that does not feel very clear in the long run. The technical details, production design and performances compensate a bit for the flagging story, but if you have a realistic expectation of the film, you will enjoy it a lot more.
