Enjoyable, smart WWII thriller about code breaking, based on a true story, and notable for being a war film more about human intelligence then daring action. The script by Tom Stoppard is strong.
While it's a very good film, some irritating flaws keep it from being great. With the exception of Kate Winslet, a lot of the acting is over the top. Worse, the film wimps out on the true story, and misses some fascinating complexity, since in real life the lead character was gay, at a time where that alone was enough to win everyone's distrust and indeed he faced persecution in the post-war years rather than being hailed as a hero. Further, the whole style of the film feels old-fashioned in a way that goes back and forth between charming and feeling forced.
And yet, all that said I'd still urge people to see it, for daring to be a wartime thriller with smarts.