Indy has the problem of the second one being pants Star wars has the problem that one of the films featured ewoks The matrix just got progressively crapper Die hard 1 and 3 were good but 2 was pants LOTR had the problem of unecessary re-writing mmmnnnnone of 'em
The Godfather. While Three didn't live up to One and Two, it's really a fine movie with one bit of really bad casting. It doesn't deserve the derision is sometimes gets, and One and Two rank among the best movies ever made.
What about trilogies that are no longer trilogies? Can they still count I wonder? The original Alien trilogy, or Superman. Another true trilogy I left out was Karate Kid...well I liked it anyway.
Difficult to choose this is. Indy and the Godfather films are my favourite. As what what qialifies as the best, can't decide.
There's actually going to be another Oceans movie? Maybe it will make the updated poll a few years from now.
Other possible mentions:- Austin Powers Mad Max Major League Mighty Ducks Mimic Missing in Action Mission Impossible Beverly Hills Cop
Star Trek II - IV could be considered a trilogy as well. That's my choice (although there are several great ones in the poll.)
Never Ending Story Naked Gun Blade Pirates of the Carribean Porky's Crocodile Dundee Robocop Rush Hour The Santa Clause Scream Shrek Free Willy Toy Story