It’s a little intimidating to write about such a classic. But I agree it’s a great movie. Story, atmosphere, the filming, set design and costumes, acting: all superb. The only negative thing I can say, is that I sometimes found it difficult following the plot, with its many characters and all this macho mafia business.
Overall, though, it’s a classic for a reason!
This also must’ve been one of most explicitly violent movies at the time. And I found it amusing that I didn’t recognise Al Pacino and Robert Duvall at first, because I’m used to their much older faces from much more recent films.