This is what some critics have to say:
Followers of Maringouin's impressive, disturbing feature debut, "Running Stumbled," may not spot the filmmaker's touch in the brightly amusing first 30 minutes, but gradually, as the 52-year-old Martin ventures deep downstream and flirts with his physical limits, the disorienting strangeness of "Running" seeps into "Big River Man," resulting in something much darker than a merely amusing promo reel for the Slovenian swimmer.
- Robert Koehler, Variety
People don't get much more documentary-worthy than Martin Strel... film-maker John Maringouin could hardly fail to come up with a good story. In the event, he got an absolute epic, in which Strel loses his marbles and insists on keeping swimming despite severe risks to his physical health.
- 4 Stars, Edward Porter, London Times
Director John Maringouin has chanced upon documentary gold - Strel is the sort of off-kilter character even the most imaginative fiction writer would have had trouble dreaming up.
- 4 Stars, Tim Evans, Sky News