There are many superhero movies in the MCU, the DCU, and beyond which have endings that have remained excellent even years later. The movies of the MCU have elevated the superhero genre to unprecedented heights of success, but adapting comic book stories to the big screen is a practice that predates the franchise’s popularity by a considerable margin. The superhero genre has been going strong for decades, with many notable movies standing out as especially excellent or influential.

https://screenrant.com/superhero-movie-endings-aged-well-list/