This is really not a good idea. Batman works a as a dark movie, yes. Batman is a dark character, that's fine that works for him. Superman isn't. Superman is about light and hope. That's partly why the Supes/Bats comics work so well - light vs dark. They bounce off each other.
Applying the same methodology and thinking to both of them will result in at least 1 fucked up movie. Plus, the darkness wasn't what made The Dark Knight movie so good. There were loads of other factors - plot, acting, characterisation, detail, thought.
Superman doesn't work when he's made dark. He's uplifting, he shows us there's a better way, and he shows us what the possibilities are. He's not Batman!
And also I thought Superman Returns was a damn good movie and Bardondon Routh made a good Clark and Supes. As a lifelong Christopher Reeve fan that's saying something! The only fault I can find with it is that more dialogue would have been good - it was very action orientated. That doesn't make it a bad movie, but it could have been better. And the apparent stalking doesn't bother me, at all.