"I didn't quite manage what I hoped I would throughout the trilogy," he said. "Chris [Nolan] did, but my own sense of self is like, 'I didn't quite nail it'," the actor said in an interview.
For many fans, the takeaway from the hit movie was that Heath Ledger's act as Batman's nemesis Joker was more interesting than the protagonist.
Ledger's performance also earned him the best supporting actor Oscar (posthumously) in 2008.
It seems, Bale agrees with the majority.
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"Heath [Ledger] turned up and just kind of completely ruined all my plans. I went, 'He's so much more interesting than me and what I'm doing'," Bale said.
Bale said that he had a specific sense of who Batman was and how he related to Bruce Wayne.
"Batman, he's just this very, very, very dark, messed-up character," said Bale. "I found when I put on the [Batman] suit, I felt like, 'I just feel like a bloody idiot if I don't use this as a means of - it's kind of his true monstrous self that he allows to come out in that moment.' "
Actor Ben Affleck will be seen donning the Batman avatar in "Batman v Superman: Dawn of Justice", which will hit US theatres on March 25.