The language is too informal, and readers aren’t sure who “they” might be.
Think about how narrow or how broad your introduction should be and what you’ll include in your opening paragraph to help readers understand what you’re writing about. Bad strategy to introduce the topic: Batman debuted in comic books in 1939 and has been popular ever since.
Batman was a television show in the 1960’s and was also remade into many feature-length movies.
This type of statement will work well if readers are fans of Keaton or if readers are fans of Nolan, as they’ll want to read on to see why you think Keaton is so much better.
Think about what readers need to know to understand the focus of your paper.