how bout godfather III?
This is the only right answer lol. I know dudes in here are talking comic flicks but let's breakdown why Godfather 3 is the worst third film:
It's the follow up to a pair of best picture winning films with the same academy award winning director and the same lead actor, who was also an academy award winning actor. It was supposed to be a home run, the finale to the Corleone family saga, showing Michael as an old don trying to go legitimate but also knowing he'd have to atone for his sins and pay the piper so to speak.
Then the movie comes out and it's boring for one. For two, Sofia Coppola is not the person who should've been the 2nd lead in the movie, many of the favorite characters and important characters from the first two movies are nowhere to be found, so it feels unfamiliar and foreign.
The plot is all over the place, the direction isn't there and as it turns out, Francis Ford Coppola only did it because he was in a dire financial situation. In his mind, the story was told after 2 movies and he's right, so this is a pure cash grab, just trying to patch a story together and everyone involved is just working for a paycheck
"Iron Man 3" being on this list has to be a joke.

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I just don't know what the hell they were thinking.

Although with Carnage, there isn't much to get right. Just have a lunatic going around killing people without any sense of purpose or machinations.
. I know a lot of us are 90s kids but I'll never understand the love for Carnage. At least Venom is good from a character standpoint. Carnage would be dope if he was at least smart. Joker in The Dark Knight is how I'd do Carnage: a maniac who's smarter than he appears to be and exists only to push Spider-Man to the brink and challenge his sense of morality