CGI soldiers
CGI or computer-generated imagery has gotten a bad reputation over the years and is controversial. Some people love what it brings to cinema and others think it makes everything look cheap and soulless. Wherever you stand on the argument, you probably had an opinion about the CGI stormtroopers in Revenge of the Sith.
Every single stormtrooper in the movie was CGI and not a real actor in a costume. They managed to save a lot of time and money on effects, but we have to admit it did not look great. Those were the years of earlier CGI where it felt like we were watching a giant video game.