re: Is Oppenheimer politically slanted?

I don’t think so. If you go into the movie knowing what it is, a biopic about Oppenheimer who was a man of many many many contradictions, he was a communist but refused to join the communist party and chose to help the US largely out of his own ego and ambition which destroyed him late in life so you should expect that to be involved. I don’t think it gives any particular credence to any one ideology being better like Marxism would be utopia if we all just believed enough like films usually do. It simply presents pretty neutral facts and yes stuff about that is in there. If that’s too political for you I’d pass