First off, let me just say that I highly respect Mr. Markopolos and fully acknowledge that he was one of the few people who labored mightily to bring down the Madoff fraud. Unfortunately this documentary comes up way short when discussing the nature of the Madoff scheme, then quickly drowns in over-dramatizations of Markopolos extreme paranoia.
If you wish to gain a better understating of the Maddof affair and how Harry Markopolos fits into the picture, I highly recommend Frontline's documentary on this topic, or Diana B. Henriques book "The Wizard of Lies." If you want to see 45 minutes of extraneous footage of Mr. Markopolos loading clips into handguns, putting on body armor, or peeking through blinds, this is the movie for you.
Look, I get that Mr. Markopolos probably felt a great deal of stress going up against someone as powerful as Madoff, but in hindsight the level of his panic was probably not justified; the story since revealed shows that Madoff didn't regard Markopolos or the Media as anything other than a small roadblock to amassing new clients. Markopolos really jumps the shark when, after the Maddof scheme implodes, he becomes absolutely convinced that the SEC is imminently going to execute a raid on his home and assassinate him and his family in order to hide the evidence of the SECs failings. He has his wife stand at the top of stairs, gun drawn, with instructions to shoot anyone who tries to enter; meanwhile he goes to a nearby pizza shop to fax some documents to a reporter. The whole segment is absolutely bizarre.
Frankly, if Markopolos acted at all in person like he comes off toward the end of this documentary, I can understand why so many people wrote him off as someone whom not to take seriously. This in no way excuses the SEC from its failure to act however. Harry Markopolos was absolutely right about Maddoff, it is just a shame that he was so ineffective at making the case to everyone else.