I think Paul Newman is pretty good, but is somehow at bottom, miscast. I think the film was better than I expected from reading Robinson's point of view in the conversations about it, but I can see how he thought it got derailed. I had never seen the film, or was much interested in it I have to admit, until I read the book 'Smoking in Bed: Conversations with Bruce Robinson.' Robinson wrote the story and screenplay.
The film's plot takes on a lot of heavy issues and the actors have to carry much of the creative tension.
The topic, about the atom bombs created at Los Alamos, NM in the USA and used on Japan during the latter part of World War II, is huge, and of course deeply disturbing.