First, pardon the generalization in the title. Third entries aren't always bad. This is just to get your attention.
Read on.
I was watching some comic book movies over the weekend and it occurred to me that, in series that go on long enough for a third film, it tends to be a massive step down from what came before. I don't know that this is a failing of trilogies in general, but it sure seems to hit comic book films pretty hard.
Examples:
Superman III - Superman II was considered quite a worthy sequel, but reaction to Superman III was decidedly mixed and mostly negative.
Batman Forever - To this day, people are of mixed opinions on Batman Returns, but at the time it highly-regarded and made serious bank. However good or bad Batman Returns was, Batman Forever was just not up to that level. It made a lot of money--enough to get another film made--but seems to be where most people agree the series took a turn for the worse.
Blade Trinity - Not that Blade was ever high art, but the first two movies were entertaining and stylish. The third was just a shambled mess.
X-Men: The Last Stand - After (what I consider) a stellar second outing, we get the bloated mess that was The Last Stand. Ugh. There are some good parts here, but by and large it really fails to live up.
Spider-Man 3 - The second Spidey flick is usually considered around these parts to be the pinnacle of comic book films. By that token, maybe SM3 was destined to be a step down. It suffers many of the same problems as the third X-Men film, primarily a lack of focus--just way too much going on, too many characters moving around, etc.
There are some series that buck the trend. I recall most people think the third TMNT film was better than the second, but then they didn't have far to go to top that, right?
What do you guys think? It just seems to be a common trend for comic book films to have a decent first movie, a step up for a second one, and then a sudden crash and burn on the third.

I was watching some comic book movies over the weekend and it occurred to me that, in series that go on long enough for a third film, it tends to be a massive step down from what came before. I don't know that this is a failing of trilogies in general, but it sure seems to hit comic book films pretty hard.
Examples:
Superman III - Superman II was considered quite a worthy sequel, but reaction to Superman III was decidedly mixed and mostly negative.
Batman Forever - To this day, people are of mixed opinions on Batman Returns, but at the time it highly-regarded and made serious bank. However good or bad Batman Returns was, Batman Forever was just not up to that level. It made a lot of money--enough to get another film made--but seems to be where most people agree the series took a turn for the worse.
Blade Trinity - Not that Blade was ever high art, but the first two movies were entertaining and stylish. The third was just a shambled mess.
X-Men: The Last Stand - After (what I consider) a stellar second outing, we get the bloated mess that was The Last Stand. Ugh. There are some good parts here, but by and large it really fails to live up.
Spider-Man 3 - The second Spidey flick is usually considered around these parts to be the pinnacle of comic book films. By that token, maybe SM3 was destined to be a step down. It suffers many of the same problems as the third X-Men film, primarily a lack of focus--just way too much going on, too many characters moving around, etc.
There are some series that buck the trend. I recall most people think the third TMNT film was better than the second, but then they didn't have far to go to top that, right?

What do you guys think? It just seems to be a common trend for comic book films to have a decent first movie, a step up for a second one, and then a sudden crash and burn on the third.