LOTR - Best Trilogy Ever
Die Hard Trilogy - 2 wasn't the greatest but I liked it
American Pie - I enjoyed every film
Back to the Future - Parts of 2 and 3 irked me
Scream Trilogy - 3rd one wasn't as good
Matrix Trilogy - 2nd one wasnt that good
Sorry to tell yas but: Indianna Jones, Godfather, Scary Movie, Evil Dead, Romeros Deads, Terminator and Jurassic Park all have 4th installments planned or made. Star wars can't be considered a trilogy anymore cause it will have 6 installments.
Oh I did hear about a 4th Die Hard but then found out after 9/11 it most likely won't be made 🙁
Heres hoping for part 3 of the Conan saga
Xavier:
SW is still a trilogy. What it is though, is actually 2 trilogies. The first 3 movies (A New Hope, Empire Strikes Back and Return of the Jedi) are indeed a trilogy and will usually be referred to as the "original trilogy". I'm not sure what people will call the last 3 movies, but I'm inclined to go with "Prequel Trilogy".
JM2CW