Meh. Wasn't a huge fan of 300 or Watchmen, though I did like the latter more than the former. The stylistic similarities between the two movie (with nothing in common in terms of content) is disquieting, since it seems to indicate a lot of Snyder-isms are part of his regular style and could show up in Superman too....
Oh well, the script I think is what's important here.
You know the kind of Superman movie I'd love to see... an ID4 type invasion movie. But instead of some dorky scientist saving us, it's Superman who saves us by doing mind-boggling heroic acts. Honestly the most impressive thing Superman did in 'Returns was pick up an airplane. Boring.