Now that I think about it, this is an inappropriate title for a thread. Best trilogy of the millennium could be misinterpreted in many ways. for one thing, it could mean in the last 1000 years, or it could mean THIS millennium (2001+, as Fini pointed out so nicely 😄). And movies themselves have only been around for about 70+ years, much less trilogies. There aren't that many really GOOD trilogies to choose from.
...........yeah
Why is Star Trek on that list? Trilogy means 3 movies............there were 7 movies with the original cast and 4 movies with the Next Generation cast.....that is a total of 10 movies.
I'm going with Indiana Jones............it edged out Star Wars only because Jedi ruined the trilogy (which can no longer be considered a trilogy as 5 movies have been released)