Although Brad Pitt has been a certified A-lister for more than two decades, and has a resume full of smash hits, he doesn't consider 'The Devil's Own,' to be one of them, and lists it as the lowlight of his career so far. Given that he's a little choosier with his film work these days, it seems likely that it will never move off the bottom spot (although he might have been tempted to revise his opinion after 'World War Z').
It's hard to get a handle on exactly what Pitt disliked about it so much, but he's used the curious description of 'irresponsible filmmaking' to describe what happened on the set, and his experience of making the film. It wasn't just the process either - he doesn't think the film was very good. Fortunately, he's made enough smash hits for most people to forget he was even in it.