A technical achievement. The movie is really well-shot and quite a spectacle. The performances were great too.
However, I feel like Nolan's tendency to accentuate the spectacular over the more subtle notions once again was a bit of a detriment. To be fair, he seems to have gotten better at depicting emotional interaction, there were only a few pieces of dialogue that felt stilted. But his baffling decision to check off most of Oppenheimer's liaisons as well as a lot of points of interest in his biography without actually giving them enough time to breathe and develop, made the movie seem quite bloated.
The sequence depicting the Trinity test and the aftermath - as seen from the perspective of Oppenheimer, were quite powerful. But leading up to that was a methodical checklist of events in Oppie's life that would have been interesting, if only some of the consequences of the subjects touched upon were actually shown or explored more.
And after the Manhattan Project section, the movie turns into Twelve Angry Men with a constant overbearing score in the background and a ton of exposition. Also: None of the quiet discomfort of Twelve Angry Men.
I wished someone had told Nolan to dial it down a bit and actually focus on what kind of movie he wants to make - because when it was good, it was REALLY GOOD. Cillian Murphy is great in the lead and the performances in general did lend a lot of personality to the overall atmosphere. But the way the story was told seemed a tad disjointed.