My mans went to see it, he said it's very good and on par with Casino, The Departed and Goodfellas. He said it's the best movie he's seen in the last couple of years and it's also very violent versus his other films. He gave it a 10/10 and thinks it'll sweep the academy awards.
Reviews at metacritic and rotten tomatoes have this at 96% and 94% respectively.
This is made in the same style as Goodfellas & Casino with the narrations and flashbacks. A lot of violence on display.
It touches on a lot of mob history and famous gangsters.
The Kennedy Family
Crazy Joe Gallo
(If you know your mob history like me, these names mean something)