Despite the big names and talented actors who have donned a Marvel superhero costume on the silver screen through the years, there really is only one man/character who could be considered the “face” of the Marvel Cinematic Universe. And that’s supremely talented actor Robert Downey Jr. The 59-year-old actor portrayed Tony Stark/Iron Man in the MCU, and his impact on the franchise can’t be understated. Downey’s acting credits may include literary legends like Dr. Dolittle, Sherlock Holmes, as well as real-life figures like Lewis Strauss in “Oppenheimer,” but his turn as Iron Man is probably wha…