Other reviewers at the top, when sorted by Helpfulness, have already covered much of what makes this film so exceptionally good. As such, and knowing that I have a tendency to sometimes exceed the number of allowed characters, I'd like to add just a couple of small things.
First, the sets and costuming were near perfection. Every SINGLE piece of clothing which the characters wore, down to cuff-links, handbags, hair pins and shoes were of the era. That kind of meticulous detail can only bode well for a film. If the creators care enough about the small details, imagine what they do with the big ones.
Secondly, in many films now, where there is a well-known and varied cast, you find that the screen time each devotes in comparison to the film run time, really leaves a little to be desired. That is not the case here. Almost every second of every scene is filled with one or more of these masterful actors, actually acting. Performing. Pulling you in to the world they are creating. All, without the need of heavy CGI or filler. As Hoffa might say: they get right down to brass tacks - and, pardon the pun, deliver.
DeNiro, Pacino, Pesci, Keitel. Enough said. Leave politics at the door, and enjoy.
Excellent film all around.
