This list will also include duologies, quad-trilogies, and eras (showa Godzilla era, monster verse). I will also include in franchises who have multiple movies and split them (Predator, Harry Potter, Scream)
Star Wars Original Trilogy:
A New Hope: 9.5/10
The Empire Strikes Back: 10/10
Return of the Jedi: 9.5/10
Overall Trilogy Rating: 9.7/10
Into the Spider-Verse: 9.6/10
Across the Spider-Verse: 9.4/10
Beyond the Spider-Verse: ?/10
Overall Duology Rating: 9.5/10
Back to the Future Trilogy:
I: 10/10
II: 9.3/10
III: 9/10
Overall Trilogy Rating: 9.4/10
Toy Story: 9.7/10
Toy Story 2: 9/10
Toy Story 3: 9/10
Overall Trilogy Rating: 9.2/10
Spider-Man 1: 9.5/10
Spider-Man 2: 9.6/10
Spider-Man 3: 8.6/10
Overall Trilogy Ranking: 9.2/10
Chapter 1: 9.5/10
Chapter 2: 8.8/10
Chapter 3: 8.8/10
Chapter 4: 9.7/10
Overall Quad-trilogy Ranking: 9.2/10
Planet of the Apes trilogy:
Rise: 8.9/10
Dawn: 9.4/10
War: 9.0/10
Overall Trilogy Rating: 9.1/10
Batman Begins: 7.9/10
Dark Knight: 9.6/10
Dark Knight Rises: 9.4/10
Overall Trilogy Rating: 9/10
First Avenger: 7.5/10
Winter Soldier: 9.1/10
Civil War: 9.5/10
Overall Trilogy Rating: 8.7/10
Kung Fu Panda: 8.6/10
Kung Fu Panda 2: 9/10
Kung Fu Panda 3: 8.2/10
Overall Trilogy Rating: 8.6/10
Scream V: 8.4/10
Scream VI: 8.5/10
Scream VII: ?/10
Overall Duology Rating: 8.5/10
The Avengers: 8.5/10
Age of Ultron: 6.4/10
Infinity War: 9.8/10
Endgame: 4.5/5
Overall Infinity Saga Avengers Rating: 8.4/10
Ghost Protocol: 7.3/10
Rogue Nation: 8.3/10
Fallout: 9.6/10
Overall Trilogy Rating: 8.4/10
Madagascar: 8.8/10
Escape 2 Africa: 8.4/10
Europe's Most Wanted: 8/10
Overall Trilogy Rating: 8.4/10
Mad Max: Fury Road: 8.6/10
Furiosa: A Mad Max Saga: 8.0/10
Mad Max: Wasteland: 8.3/10
Scream: 9.5/10
Scream II: 8/10
Scream III: 7.6/10
Scream IV: 7.6/10
Overall Quad-trilogy Rating: 8.2/10
A Quiet Place: 7.9/10
A Quiet Place 2: 8.4/10
A Quiet Place 3: ?/10
Overall Trilogy Rating: 8.2/10
Homecoming: 8.3/10
Far From Home: 6.5/10
No Way Home: 9.6/10
Overall Trilogy Rating: 8.1/10
Blade Runner duology:
Blade Runner: 6.5/10
Blade Runner 2049: 9.6/10
Overall Duology Rating: 8.1/10
Monster Verse Era:
Godzilla: 7.4/10
Kong: Skull Island: 7.6/10
Godzilla: King of the Monsters: 7.1/10
Godzilla vs Kong: 8.6/10
Godzilla x Kong: The New Empire: 8.9/10
Overall Era Rating: 7.9/10
Star Wars Prequel Trilogy:
The Phantom Menace: 7.1/10
Attack of the Clones: 6.6/10
Revenge of the Sith: 10/10
Overall Trilogy Rating: 7.9/10
Paddington: 8.4/10
Paddington 2: 9/10
Paddington 3: 6.4/10
Overall Trilogy Rating: 7.9/10
Shrek 1: 9.5/10
Shrek 2: 9.7/10
Shrek 3: 4.4/10
Shrek 4: 7.4/10
Overall Quad-trilogy Rating: 7.8/10
Alien: 9.0/10
Aliens: 9.3/10
Alien 3: 3.9/10
Alien: Resurrection:
Overall Quad Trilogy Rating: 7.4/10
Deadpool: 7.3/10
Deadpool 2: 6.2/10
Deadpool & Wolverine: 8.6/10
Overall Trilogy Rating: 7.4/10
Transformers Reboot Duology:
Bumblebee: 7.8/10
Rise of the Beasts: 7/10
Overall Duology Rating: 7.4/10
The Angry Birds Movie: 7.2/10
The Angry Birds Movie 2: 7.3/10
The Angry Birds Movie 3:
Overall Duology Rating: 7.3/10
Beverly Hills Cop: 7.1/10
Beverly Hills Cop 2: /10
Beverly Hills Cop 3: /10
Beverly Hills Cop: Axel F: /10
Overal quad-trilogy rating: /10
Jurassic Park Trilogy:
Jurassic Park: 9.3/10
Lost World: 6.4/10
JP3: 4.9/10
Overall Trilogy Rating: 6.9/10
Despicable Me: 8.2/10
Despicable Me 2: 8.0/10
Despicable Me 3: 5.1/10
Despicable Me 4: 5.8/10
Overall Quad-Trilogy Rating: 6.8/10
Iron Man: 8.4/10
Iron Man 2: 5.8/10
Iron Man 3: 3/5
Overall Trilogy Rating: 6.7/10
Karate Kid: 8.1/10
Karate Kid 2: 5.6/10
Karate Kid 3: 6.3/10
Overall Trilogy Rating: 6.7/10
The Amazing Spider-Man 1: 6.8/10
The Amazing Spider-Man 2: 6.4/10
Overall Duology Rating: 6.6/10
Ant-Man: 7.0/10
Ant-Man and the Wasp: 7.2/10
Ant-Man and the Wasp: Quantumania: 5.5/10
Overall Trilogy Rating: 6.6/10
Mad Max: 7.0/10
Mad Max 2: 8.1/10
Mad Max 3: 4.5/10
Overall Trilogy Rating: 6.5/10
First Class: 6.6/10
Days of Future Past: 8.5/10
Apocalypse: 5.0/10
Dark Phoenix: 5.3/10
X-Men Prequel Quad trilogy: 6.4/10
X-Men Origins: Wolverine: 2.5/10
The Wolverine: 6.2/10
Logan: 9.6/10
The Wolverine Trilogy: 6.1/10
Mission Impossible: 7.3/10
Mission Impossible II: 4.0/10
Mission Impossible III: 6.9/10
Overall Trilogy Rating: 6.1/10
King Kong (1930s) Duology:
King Kong: 8/10
Son of Kong: 4/10
Overall Duology Rating: 6/10
X-Men: 6.0/10
X2: 7.3/10
X-Men: The Last Stand: 4.6/10
Overall Trilogy Rating: 6/10
Godzilla Showa Era (multiple films):
Godzilla: 8.5/10
Godzilla Raids Again: 6.2/10
King Kong vs Godzilla: 5.7/10
Mothra vs Godzilla: 6/10
Ghidorah: 6.6/10
Astro-Monster: 5.6/10
Ebirah: 6.8/10
KK Escapes: 5.2/10
Son of Godzilla: 5.3/10
Destroy All Monsters: 7.4/10
All Monsters Attack: 2/10
Godzilla vs Hedorah: 7/10
Godzilla vs Gigan: 6.5/10
Godzilla vs Megalon: 3.3/10
Godzilla vs Mechagodzilla: 6.8/10
Terror of Mechagodzilla: 6.2/10
Overall Era Rating: 5.9/10
Thor: 6.5/10
The Dark World: 3.9/10
Ragnarok: 8/10
Love and Thunder: 5/10
Overall "Quad-trilogy" Rating: 5.9/10
Halloween: 7.3/10
Halloween Kills: 6.5/10
Halloween Ends: 3.6/10
Overall Trilogy Rating: 5.8/10
Predator: 8.1/10
Predator 2: 5.2/10
Predators: 6.6/10
The Predator: 2.6/10
Overall "Quad-trilogy" rating: 5.6/10
*will make a new entry for Prey when sequel and/or 'Badlands' releases*
Transformers: 6.8/10
Revenge of the Fallen: 2.4/10
Dark of the Moon: 6.9/10
Overall Trilogy Rating: 5.4/10
Batman: 8/10
Batman Returns: 5.1/10
Batman Forever: 5.5/10
Batman & Robin: 2.4/10
Overall Burtonverse Rating: 5.3/10
Megamind: 8.9/10
Megamind vs the Doom Syndicate: 0.6/10
Overall "Duology" Rating: 4.8/10
Star Wars Sequel Trilogy:
The Force Awakens: 6.5/10
The Last Jedi: 3.5/10
The Rise of Skywalker: 3.6/10
Overall Trilogy Rating: 4.5/10
Age of Extinction: 3.6/10
The Last Knight: 3.8/10
Overall Duology Rating: 3.7/10
Michael Bay TMNT Duology:
TMNT: 2/10
Out of the Shadows: 1.7/10
Overall Duology Rating: 1.9/10