LOTR is better than this

of course each film had its issues but overall they are as close as you can to making a perfect trilogy epic. oh and they are a trilogy. here's the definition of a trilogy from Oxford university, dictioanry.com, Cambridge university, collins dictionary

"A trilogy is a set of three works of art that are connected and can be seen either as a single work or as three individual works."

"a series of three books, plays, etc. written about the same situation or characters, forming a continuous story"

"a group of three related novels, plays, films, operas, or albums."

"a group of three related things."

"A trilogy is a series of three books, plays, or films that have the same subject or the same characters."