The first 2 hours and 15 minutes was very briskly paced; it felt like there wasn't an ounce of fat. The near-constant musical score (I love Ludwig Goransson) maybe contributed to the feeling, occasionally, that we were watching a mammoth montage, not a movie.
Way more sex and nudity than I expected - is Florence Pugh known for her nude scenes, and I'm the last to find out?
Because of the framing device, where Oppenheimer defends his life before a board scrutinizing his security clearance renewal, there's a sloggy 45 minutes after the Trinity test, for the movie to wrap up.
Like David Lean and Kubrick before him, Christopher Nolan's movies are best seen on the movie screen. Not recommended for home viewing, unless you have a big TV, loud sound system, and watch it with the lights out. (Beacon Cinema, Pittsfield, MA)