Ben Affleck was not sure about playing Batman

Ben Affleck has revealed that he was doubtful about donning the cape as the fifth Bruce Wayne/Batman in Zack Snider's "Batman v Superman: Dawn of Justice" but the director convinced him to do the famous role.
The announcement of Affleck's name as the Caped Crusader had met with backlash from fans and the actor said he too found it strange to be playing a superhero after turning 40, reported the Entertainment Weekly.
"My first reaction was, 'Are you sure?'? At the time I was 40, 41, and had just finished Argo, and I felt like 'This seems like a strange way to get to Batman.' But Zack convinced me," the actor said.

The movie revolves around an older, world-weary Batman.
"He really keeps up the image of the playboy, actively. So you have more of a dichotomy which I thought was really fun, and a little sad, like the aging playboy," Affleck said.
Another reason for the "Argo" director to take up part was to get to see the inside of a big production.
"I thought if I was going to direct a movie like this, which I would like to do at some point, I need to have something of a refresher course of how these movies are done," said the actor, who is ending his marriage with Jennifer Garner after a decade.