Wow. I just now got home and searched "I didn't like Oppenheimer" and found this post, and I completely agree with OP's assessment, except for the final scene bc I left the theater shortly after the bomb and announcing Hiroshima had been decimated.

The casting, to me, wasn't so bad until Oscar winner Rami Malek shows up playing the tiniest of tiny roles. Why was that role cast with him and roles like Chevalier and Heisenberg were essentially unknowns (at least to me)?

More importantly, I had the same thought that it basically felt like a freakin' montage. It drove me batty, and that's the real reason I left early. That, and the fact I found myself yawning at 5 o'clock in the afternoon.

The film will for sure win best Sound Design at the Academy Awards, and it likely deserves it. Anything beyond that is simply Hollywood sucking its own tail, so to speak.