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Jason Isaacs is probably my favorite adult from the entire franchise, he's such a cool and nice guy.Well, that was in 2011. I think that Fiennes was talking more about the scripts (which be honest, they aren't so great) than the story itself. And he was just finishing Coriolanus and other films.
Given Ralph's latest interview, seems that maybe he has read the books and understood better the story and message of them, which is why he's interested.
It's also true about how some older actors didn't cared about the saga, but most of them we're just for 5 minutes on each films, and some of them complained about how the studios we're doing it (like John Hurt complaining about WB wasting money on stuff they weren't going to do), but there we're some who loved it (Maggie Smith decided to act in the last films even when she was dealing with a breast cancer, Jason Isaacs begged to Rowling to give Lucius more scenes).