I'm sure the truth lies somewhere in the middle. Biopics, biographies, and autobiographies don't show you all the little moments that make people human beings. No racist jokes between close friends under a hush, no one farts as loud as possible and yucks about it for a minute, you don't see secret weaknesses/insecurities exploited during a lover's spat, or the minor squabbles we all participate in as life slowly passes, so on. Just the hard-hitting stuff gets in because of time-constraints, or message-sculpting. Regardless of who is telling the story, or what it's about, the smart money is that it's embellished here and there. If there's a sleazy record producer, corrupt politician, or rival (insert sportsball) player or coach they are rarely fleshed out, or given motivations beyond "obstacle for protagonist". That doesn't make me less excited to see this film, it's on my must-see list.
No one is as heroic, or evil, as they are made out to be by the media at large.