This is the film that kicked off the new era of blockbusters – an era we're still in. It put Spielberg on the map and was the start of a run of films unequaled to this day by any single director: Close Encounters of the Third Kind, E.T., Raiders of the Lost Ark (and its two sequels), Jurassic Park, Schindler's List and Saving Private Ryan. It's not the sea monster that made this film great. It's the tension of knowing it's out there, unseen, but lurking – brilliantly revealed by John Williams' suspenseful music (that initially underwhelmed Spielberg).
The cast all had stories that made them likable and sympathetic. One story in particular was horrifying. We all know the story I'm referring to, based on a real life event. A perfect film made better by the fact that the animatronic shark malfunctioned so often that Spielberg had to imply its presence rather than show it for much of the film. What we can't see is often more scary than what we see. A flawless film.