3Batman and Robin
Superhero movies are those that probably bring in the bulk of the cash, and that is the main reason why they have sequels (or had back in the day). One of the superhero movies that had the most transformation is definitely Batman, and it has changed a lot from the Michael Keaton days. The biggest mistake in the franchise was definitely George Clooney who was not dark enough for the role of the Dark Knight. Yes, he could play Bruce Wayne the playboy millionaire excellent, but Batman is out of the question.
