The story is fairly simple, it's about a killer shark, which has been copied 1500 times, but since it's the original and that's why it get extra points.
The caracters are highly likable and are well written, and i am happy to see a "'nerdy" type of caracter that's not a stereotype that annoys me everytime.
The shark looks great for 1975
The final scene when the shark is blown up by Roy Schneider is my personal favorite of all the scenes
Overall its one of my favorite movies, just classic