I have very much enjoyed that Amazon has put most of the James Bond series online. The series defined a generation of spy thrillers and suspense storytelling that has influenced much modern filmography. Dr. No is certainly a classic, but Goldfinger refined and perfected that James Bond has become, and Sean Connery defined 007. Gert Frobe played an Auric Goldfinger, providing an almost believable villain in a way that was not over the top as some more recent villains. He didn't overact. One of my favorite exchanges:
Bond: Do you expect me to talk?
Goldfinger: No, Mr. Bond, I expect you to die.
One of the fatal flaws in evil overlords is the tendency to monologue while the hero gets ready to escape. Goldfinger didn't do that, preferring to get rid of his potential competition, whether a shady Mafia character or a British Secret Agent. I still enjoy the professionalism of Bond in this movie. While there's some humanity in him, there is not the angst over people dying. It's part of the business, and we don't need to see what comes after the movie is over when Bond goes off to hibernate for several days after a harrowing adventure.
If one were to view only three movies in the Bond franchise, it would be to watch Dr. No, Goldfinger, and Thunderball, probably in that order. These movies provide great classic entertainment.