Wow. Just.. wow. Anything more would be spoilerish.
Great effects, decent acting, and I believed in Superman. Kevin Spacey was deliciously evil as Luthor. Some nice cameos (the George Reeves TV-show Jimmy Olsen and Lois Lane show up, as well as Richard Branson as a Virgin Galactic pilot) and enough in-jokes to keep the geeks happy.
Go see it. I give it five penguins.
( I can't stop being logical )