Oak. What you mention about Donnie Brasco and Goodfellas is common in all movies of every genre. Stuff like writing one character as a composite based on numerous real life people.

Where Gotti differs is that it's more akin to a propaganda tool or promotional exercise for the Gotti family than it is anything resembling artistic integrity.

There is a reason why the director was some nobody with no experience of directing a movie of any magnitude or acting in anything of any magnitude (save for Entourage). They couldn't get a decent director, or any decent actors, to have anything to do with this because the circus like production made it abundantly clear they were more interested in rewriting history and glorifying a deadbeat killer and criminal than making a movie with substance.

That's why you regularly had respected actors like Joe Pesci being misled and walking away from production and that's why you had an extended cast made up of the same idiots who build careers around portraying knockaround guys in low-end mob productions and episodes of Law and Order.