Though it is clearly based on research, with dialogue that scavenges the principals' own writing--it is never quite believable, either as history or drama.
It's a disheartening misfire: a big, bland historical melodrama built on platitudes about honor and the writing life that crams in actual figures and incidents but does little to illuminate them, or to make us care about the romance at its center.
Not only is Hemingway and Gellhorn wretched, it is bathed in pretentiousness and pseudo-intellectual delusions of grandeur. It's not just crap, it's expensive, painfully "artistic" crap starring a lot of actors who should have known better once they took a look at the script, which is hilariously awful.