It was an eye opener for me too, the documentary made a convincing case that LHO was the lone assassin and totally debunked the 'magic bullet' argument. It also built a convincing case as to his motivation.
The extent of the Oliver Stone deception was shocking too, as was his honest admission of it. The telling conclusion being that his film JFK was for many people the first and last word on the event and has persuaded millions that the conspiracy theories were true.
It will be interesting to read the views of others with more detailed knowledge of/belief in the various conspiracies surrounding the assassination of JFK than I have.
btw for people outside the uk who may have seen this in their own countries the documentary I saw was titled - Kennedy 40: Kennedy Assassination - beyond Conspiracy