EntertainmentMoviesSuperhero MoviesMCUChristopher Nolan says Robert Downey Jr. as Iron Man is one of the most important casting decisions “in the history of the movie business"When you purchase through links on our site, we may earn an affiliate commission.Here’s how it works. EntertainmentMoviesSuperhero MoviesMCUChristopher Nolan says Robert Downey Jr. as Iron Man is one of the most important casting decisions “in the history of the movie business"When you purchase through links on our site, we may earn an affiliate commission.Here’s how it works. When you purchase through links on our site, we may earn an affiliate commission.Here’s how it works. (Image credit: Marvel Studios) It’s no secret that the MCU has been a cultural juggernaut since its inception in 2008 (even if its influence seems to be on the wane amid a touch of superhero fatigue), and the de facto face of the cinematic universe has always been Robert Downey Jr.’s Iron Man. It …