Oscar-winning actor Gary Oldman starred in the Harry Potter movie series as Sirius Black, and the actor credits the role with making him a better father. But Oldman didn't love everything about the Harry Potter series. On the Happy Sad Confused podcast, Oldman said his performance in the films was "mediocre."

"I think my work is mediocre in it," Oldman said. "No, I do. Maybe if I had read the books like Alan [Rickman], if I had got ahead of the curve, if I had known what's coming, I honestly think I would have played it differently."

Oldman made his debut as Black in The Prisoner of Azkaban. He played the role again in Goblet of Fire and Order of the Phoenix. Fans often say Oldman turned in a memorable performance. But Oldman himself doesn't see it that way, for Harry Potter or any of his other work.