I don't think the analogy to Superman
really works, because Dredd
isn't a big-budget star-studded movie in any case. It's a fairly small movie that doesn't have any massive star power. Lena Headey is fairly prominent, but she's certainly not in the league of Marlon Brando or Gene Hackman when it comes to celebrity standing. I'd say, in fact, that Urban was the second most prominent member of the film's cast. He and Headey were the only cast members I'd ever seen or heard of before, although I gather that Olivia Thirlby has some name recognition from Juno
and one or two other things.