I watched it and overall I think it was done well; for Huskers fans probably not a lot of new information, although I did not know that Osborne had threatened to kick LP off of the team if he wouldn't leave McEwen alone - and this was BEFORE that fateful night. That, and the prosecutor who argued that he murdered his cellmate, stating that there was no way that he was murdered. If you go by just the documentary, there seems to be enough 'reasonable doubt' to look into it. That part irritated me; like she's SO certain he wasn't murdered yet they mentioned the 'joke' found in his belongings...
Overall it does get across that LP had a rough upbringing, but I don't think it excuses his behavior. Plus it does illustrate that he had multiple opportunities to turn himself around. A sombering watch, to be sure.