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Has ‘Iron Man 3’ fallen victim to the threequel curse?

Iron Man 3 hit theaters this weekend, and while its massive box office numbers tell the story of yet another Marvel blockbuster, it may end up joining the ranks of Spider-Man 3, The Matrix Revolutions, Godfather: Part III, and X-Men: The Last Stand in the bargain bin of cursed trilogies that ended with fans expecting more. (spoilers)