Really, a lot of MCU from Iron Man (well, even further back to Captain America, heh) forward until Endgame was very good. There were some occasional average movies, but for the most part, really top notch for the genre. I know it's a lot to watch, but I've really enjoyed the whole pulling stories together into a larger epic saga. My parents (in their 70s) even started getting into it, which kinda surprised me. I basically get them into it last December when we went to their place for Christmas and we watched Avengers together. They loved the Avengers movies and decided to start from the beginning and went through the entire series of movies and TV shows.