Of all the movies set in J.K. Rowling's magical world, Harry Potter and the Half-Blood Prince is the film in which Potter star Daniel Radcliffe is the least pleased with his performance.

Loading

Loading

“In every movie up to the sixth one, you can see a big step forward in my acting," Radcliffe said in a recent interview with Playboy (via Entertainment Weekly ). "And then it stopped, or went backward maybe, in the sixth film. I really enjoyed my performance in the fifth — part of it was how much I worked with people like Gary Oldman and David Thewlis."On the sixth, I remember watching it and thinking, Wow, there’s been no growth," he continued. "You’re watching a mistake you made every day for 11 months — that’s the way I saw it. I had the idea that Harry was like a soldier traumatized by war, and as a result of that, he shuts down emotionally. That’s not a bad idea, but it’s not the most interesting thing to watch for two and a half hours."Radcliffe also spoke to his experience growing up with the franchise, having been just 12 years-old when the first film released. The Potter star looks back on those years fondly, cherishing every moment on set."I’ve seen kids on set who are bored, and I’m like, ‘What are you doing? This is the best place on Earth,'" Radcliffe added. "I loved it from the word go. I loved being on set. I loved the hours. I loved the people. I loved the crazy, weird s--t I got to do every day. Acting was the focus for me, and I wasn’t going to do anything to jeopardize being an actor."While Harry Potter's time on the big screen has come to a close, J.K. Rowling's wizarding world will continue on, as the first installment in a series of prequel films, dubbed Fantastic Beasts and Where to Find Them, debuts next year. In fact, filming is already underway Meanwhile, Radcliffe just recently starred in BBC Films' The Gamechangers, which tells the story of Rockstar Games and its rise to success with Grand Theft Auto. Read our review here

Alex Osborn is a freelance writer for IGN. You can follow him on Twitter