Without judgement that the film may or may not be interesting. I would agree with DrB's assumption that this is more 'reality' than documentary. A documentary films records events that would happen regardless of there are cameras in place. This film is produced, and those kids (who were all sailor already, btw- but not on trans-pac level), would never have sailed that race if Disney hadn't invested in the film.
That said, I'm a reality TV junkie, and look forward to seeing the movie on the big screen.
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Movin' on up, to a deluxe apartment in the sky: