This is really a movie about Martha Gellhorn. To paraphrase her: here, Hemingway is the footnote to her life.
Nicole Kidman is an eminently capable actress; she seems to lose herself elegantly in this somewhat tainted, overly dramatic portrayal. Clive Owen's acting skills have always seemed to me the equal of those of Kidman's stature, so at the movie's outset the pair seemed well matched. However, as the war goes on between them – and around them – Owen is increasingly asked to play a supporting role to hers. I see it as the mark of a confident actor that he was able to relegate Papa Hemingway to second chair – something that never seemed to happen in real life.
Still, for Hemingway aficionados and those happy to see Gellhorn in the limelight, it's a nice piece of fictionalized literary and journalistic history.
Hemingway & Gellhorn