I agree with a lot of this, and what the other poster
@Boris Zubov who criticized the movie said. In a way, it was a really well done biopic, and even though 3 hours long, felt more like an 1 hour movie. I didn't feel bored for a moment.
But also, I think Nolan tried too much. Oppenheimer's life story, and personality, is so interesting that you just can't fit everything into one movie. So most of the characters felt quite "empty", they just said or did something and you couldn't really tell why. Characters had one scene where they said something, and that it. Basically no character development, other the Oppenheimer and maybe Kitty. And the first 30min or so felt like a montage or trailer of an upcoming Oppenheimer movie.
Oppenheimer's family, background, education, life experiences before turning 20 made who he is. And that was barely touched, other than short scenes about poison apple, being unhappy in England, and a mention that he had loved New Mexico since his late teens.
I fully understand why people like this and why it gets great reviews, and I could rate it something like 9/10. It really well done biopic about one the most interesting characters of the 1900's. And I guess he did some work with bombs as well.
But knowing the source material, there is so much potential there for a masterpiece that was wasted. Although it would need to be something like 10-15 hours miniseries to fully tell his story, and that's why I might rate it 5/10 as well.
Anyway, read the book. It's f***ing good and probably gives you a lot of insight into the movie, even if you've already seen the movie.