I don't understand how this can be released as a final product. Everything looks rushed and incomplete- the script is an incoherent mess of disparate plot threads and tacked on one-liners, the effects work is absolutely abysmal with some of the worst CG I've seen all year, and all the action sequences are boring and generic.
I know it's been memed to death already, but Henry Cavill's mouth. Millions spent on removing the 'stache? Jesus, I think most people would rather have Superman return with a wicked mustache than whatever kind of horror is happening to his upper lip in this thing.