Can I be pedantic and say that the Godfather is NOT a trilogy. There are 2 films and 2 films only, they were written and conceived as one film,Godfather 3 is some kind of monstrosity, that we should never talk about. - by the same rational Indiana Jones was a trilogy, because we should just ignore #4.
Star Wars 4,5,6. for me, it's almost flawless, written as a distinct narrative, innovative, still enjoy it, even now after 30 years.
As an aside Rogue one is the best film in the franchise outside of the original 3. I you don't agree, you're wrong.