As a fan of James Cameron, I am glad I saw this informative and engaging documentary. However, from a filmmaking perspective it's pretty standard and one can't help but wonder what it would have been like had Cameron directed it himself.
Not a great movie. And padded with too much re-creation myth making about Cameron (not a lot, but still too much). And some overly dramatic narration. And I was sometimes trying to sort out what was actual exterior underwater footage of the submersible and what might be CGI. And never quite knowing tainted my experience.
But ... some fascinating science and explo http://letterboxd.com/mharbour/films/diary/