It teaches exactly what it means to be a hero, the feverish persistence to do what is right no matter the costs.

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It teaches exactly what it means to be a hero, the feverish persistence to do what is right no matter the costs.
Endgame meets expectations without really ever exceeding them.
For the most part, the film is successful, mainly because Marvel has done a pretty masterful job of laying the groundwork during the past decade of MCU movies.