The first film in the Marvel Cinematic Universe was “Iron Man” back in 2008. There were six entries in each of the first two phases of the MCU and 11 in Phase Three. “Black Widow” kicked off Phase Four in 2021, followed by “Shang-Chi and the Legend of the Ten Rings” that same year. How do they rank among all the Marvel Cinematic Universe movies by Rotten Tomatoes? Scroll through the photos below to find out.