In my opinion, it is definitely the first masterpiece produced by Martin Scorsese and Robert de Niro. I mean, 3 years ago, they already made 'Mean Streets' together and it was a real breakthrough for both of them but it is with this movie that they started to change cinema as an Art and they will keep doing it, at least twice again with 'Raging Bull' and 'Goodfelleas'. Even if nowadays De Niro has lost his edge, he will still be remembered forever for this unforgettable piece of art. He gave one of the best perfomances of his prestigious career and, plain and simply, one of the best performances ever given on a motion picture. For Scorsese, its status changed forever from promising young director to bonafide master. I mean, the whole thing is made with some much skills, every details is closed to perfection and the story is just completely fascinating, a profound and dark study of the human soul. To conclude, it is a great classic, I just love it and it is a must see for any movie lover.