BitterCon: Three Strikes and You’re Out

I’m not particularly pining for WisCon, but for those who are, let me throw out a movie topic for discussion:

Three Strikes and You’re Out: Why Do Third Movies Suck So Much?

It’s a well-known phenomenon in genre film: in a series of movies, the third movie is almost always where the series goes off the rails. Examples abound: X-Men 3, Superman 3, The Matrix Revolutions, Return of the Jedi. What are some of the reasons for this problem? Are tthere examples of film series that avoid it? Can the Star Wars prequel trilogy be thought of as following this trajectory in reverse?

Comments are open. Go nuts.

(This topic has nothing whatsoever to do with any movies currently in theaters. Nope. Not at all.)