Giving this movie its backbone is the heavy emotional weight throughout, director James Marsh turns an otherwise quite controversial person and event into a sympathetic and quite touching story. It's a story that today needs to be told more, one of the pressures that men face and their inability to talk out about them. It's this coupled with the terrific pacing and structure of The Mercy that allows the audience to connect to Donald Crowhurst, as a dreamer and as somebody who had misfortunes that he was unable to deal with alone. It's only reinforced by the excellent performances given by Rachel Weisz and Colin Firth, that add a much-needed soulful and human touch to the film and grounding it for the audience, whereas a misplaced casting choice might have resulted in a far less captivating story.
However, while the story is one that is sure to hold a sympathetic gaze, what the film fails to achieve and execute properly is demonstrating how truly isolated and consumed with pressure Donald Crowhurst was. The film needed more time, this would have allowed further scenes of Donald on the boat so that much like The Life of Pi or even Castaway the audience could have tapped into that isolation. Instead, the film edits back and forth the boat and Crowhurst's family, this does, of course, keep the emotional tension high but dramatically it is weak, never buying into Crowhurst's isolated madness it puts the film on a weak footing. This might not have been a huge issue if the story's focal point was elsewhere but it's not, the most crucial part of the story is the pressure and isolation that Donald faced on the boat, it sacrifices a highly layered look into Donald Crowhurst for its emotional tension. The film needed less time reinforcing emotional backdrop and more time heightening the dramatic point of the story.
The Mercy is a film that depending on what you came to see, you will enjoy it more or less. The emotional backdrop is orchestrated perfectly, never missing a beat and tapping the audience into the supportive and hearty theme but the dramatic focal point of the film is underplayed and does not do much in the way of aiding the audience in its comprehending of Donald Crowhurst.