The MCU has entered Phase 4 in 2021, and many of its movies and shows have spent time fixing mistakes made in Avengers: Age of Ultron. 2015’s Age of Ultron served as the partial conclusion to the MCU’s Phase 2, and though the film was a financial success, it was a somewhat polarizing installment in the Avengers franchise, with many viewers and critics feeling that its choices in characterization and story were questionable. The following films, Avengers: Infinity War and Avengers: Endgame had far better reception, leaving Age of Ultron the closest thing the MCU had to an audience failure and the subject of in-universe maintenance for years to come.
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