Here's my unpopular opinions.
Spider-Man 1 is better than Spider-Man 2, the latter of which is completely overrated. Spider-Man 1 has better pacing, it's generally more exciting, Dafoe hams it up to awesome levels, and it's not bogged down by excessive drama like Spider-Man 2 is. Also Spider-Man 2 turns Mary Jane into a very unlikable character.
Return of the Jedi is a mediocre movie with great moments. The pacing is bad, Jabba's palace, while cool, takes up almost 40 minutes of the film. All for what? Just to rescue Han, and the movie gives him absolutely nothing to do. Then the movie grinds to a halt in the ewok village. Then we get another Death Star and locations feel underwhelming. Not to mention the weak visuals and cinematography.
The only great Star Wars movie is Empire Strikes Back. Star Wars is good, but it has pacing issues and clunky dialogue. I like Force Awakes though, it's a pretty good movie.
Days of Future past is better than First class, the latter of which is overrated.
Indiana Jones and the Temple of Doom is better than Last Crusade, which is overrated (still love it though). Raiders of course is the GOAT.
The Avengers is still the best MCU movie, and I found Ant-man to be completely mediocre and forgettable.