This movie is a terrible disappointment. It focuses on trivial aspects of the great man, Oppenheimer, who performed miracles in building the Bomb that ended WWII. He managed a tremendous crew of brilliant scientists and engineers, and overcame unimaginable technological and scientific hurdles. Instead, the movie focuses on his sex life and his possible links to the Communist party. An equivalent example would be a Hollywood epic about Shakespeare that only discusses his drinking and his pet dog, but never mentions his poetry and plays.
The style of the movie was also regrettable. Full of flips in time and place that don't make sense; smoking is emphasized. For good movies watch Casablanca or African Queen. Current Hollywood has lost its way.