I read MacIntyre's book a long time ago - 15 years? - so many of the details are just a hazy memory. But...
I watched about 45 minutes of the movie.
First of all I hate when TV shows and Movies go with "Six months earlier..." Just tell the damn story. I don't need melodramatic flash-forwards to hook me into the story.
Secondly the role of Ian Fleming is WAY overstated in the beginning of the movie. His participation was really minor.
Third, there's little description of how the plot was really hatched. This was a major part of the book, and is just glossed over in the beginning of the movie.
As much as I enjoy the female lead (Mary McDonald - she was great in "Boardwalk Empire"), her role in the story was very minor. I guess a war story about spies and submarines during WWII needed to have menstruating uterus-possessing female persons because of diversity. After all, it's their strength.
Lastly, the book makes a huge deal about how the to serve as bait was chosen. All the false starts, all the decisions, were hugely important. The movie makes it look like they just stumbled on it. Disappointment.
I need to read this book again - Macintyre is great.