It's fine if they want to do a more serious movie. But 'dark' isn't really a word to describe Superman. He's a symbol for the good in humanity, and he isn't even human. That alone is a very interesting theme for a film to explore and I feel like none of his movies have ever fully explored it.
I remember the trailers for Superman Returns and the opening of the movie which seemed to focus on the question 'Does the world need Superman?' I was really excited to see a movie that dealt with that issue on a philosophical level but of course it didn't and we ended up getting some weird film about crystals.
Sure, Superman needs to punch things, but if the focus of the film is setting up opportunities for him to do so then it's not going to be great. Without all his symbolism and what he stands for he's a pretty one-dimensional hero. Man of Steel had some good origin story stuff but in the end degraded into Superman punching Zod and destroying things. Meh.
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I think Man of Steel, clearly needed another writer on set to fix the problems that David Goyer couldn't fix himself. They needed another writer like Chris Terrio, and now that they have him (Terrio) I'm pretty sure everything's going to be fine. There won't be any lines of dialogue like Lois asking, "What if I have to tinkle?" ever again. Or at least I hope not.