Affleck, 43, who stars as Batman, spoke about the pressure for it to perform well for studio Warner Bros, reported People magazine.
"I think there is a ton of pressure on it. I mean I would be bull-----ing you to say there isn't. If it doesn't do well that will be extremely disappointing," he said.
Doing his best to ensure that the film is a success, the father of three has made the movie his priority, scheduling other filming around "Batman v Superman" - due out March 25 - as well as another DC spinoff.
"I was really impressed by the fact that he cared. It was not like some guys, especially at that level, where it would be, 'We need a franchise movie... We just need a movie with the names 'Batman' and 'Superman' on it and it doesn't matter what it is.