It was a bit too long but overall worth seeing.
I thought director Robert De Niro did a good job showing connections between World War II and post-war intelligence gathering and Cold War intelligence gathering. (The fictional relationships in the movie specifically make a connection to the botched 1961 Bay of Pigs invasion.)
Several big names had supporting roles. Joe Pesci had an unnecessary cameo. Michael Gambon, who portrays Professor Dumbledore in the Harry Potter films, played an old English spy masquerading as a Yale poetry professor.