Gangster movies are my favorite I went on a binge of them recently, excellent stuff some of these. Most I agree with, City of God was fucking awesome and one of the best shot movies ever imo. Casino, obviously great Pesci performance he was tops in that one and DeNiro was awesome. I made a whole list of 10 movies then went back to find the ones that weren't mentioned and only one remained.

Eastern Promises - One of the grittiest movies I've ever seen with a very intriguing storyline that involves the Russian mob and a few different interweaving storylines and it brings up a lot of emotion from the mentally challenged, sex trafficking to harming an infant it deals with a lot. Viggo Mortenson plays one of the most badass characters ever and has some of the coolest dialog for a character in a mafia movie ever. Has a few shocking moments, not the least of which is Viggo Mortenson fighting to the death butt naked in one of the most gruesome fight scenes ever.