I watched it last night as well and overall have to say I really didn't enjoy it. Reading Heylel's comment about the unconnected vignettes puts a good comment to one of the things that didn't feel quite right. Maybe the whole movie was just edited together poorly to provide the impact they were hoping. Cut a little here, extend a little there, and move a flashback or two around and it would have felt much tighter. Also it isn't so much that I was looking for acornfed-aw shucks-leave-it-to-beaver supermanbut the changes to his origin (or glossing over, non-focus, whatever) really made it feel rushed. As others have said it is hard to impossible to really write for Superman but I think one way you accomplish it is to rely on his back story. His development and relationship with the Kent's growing up is such a strong connection to Earth and humans that allow you to write more about someone with emotion instead of a God.
Russel Crowe was completely throw away as Jor-El, and then it felt as if they paid him all this money to be in the movie now let's find excuses to throw his hologram all over the place. And turning Krypton in to Pandora from Avatar was strange... Kevin Costner / Jonathan Kent was written as an idiot and without any of the leadership, morality, guidance that should have set the stage for why Supes feels the way he does. Let me go commit suicide to save a dog just so that no one ever knows you have any super powers! Zod was not frightening. He wore some big black armor, had a spaceship that went pew pew with lasers, and a speech impediment. His helmet broke, his senses were overwhelmed, so he cried a little bit and ran back up to his ship. Wow terrifying. The destruction of Metropolis was cool and didn't bother me. Just mostly laughed at how much of it was directly related to Superman and not Zod and his army. Superman has no problem with the shortest distance between point A and B being through 10 skyscrapers, a Sears, and 50,000 bystanders.
A lot of potential and Snyder certainly has flash and can show off scenes (although some of the CGI / effects seemed muddied almost like in Transformers, too much blur, too much filter or something). Hopefully the second go around will be better now that the groundwork is laid.