I love so much of it!!!! I loved Krypton! Giant insect flying creatures! Basically all of Krypton and it's technology is so well thought out and other worldly that it demands your full attention. I love the flashback scenes. They are the most memorable part of the film for me. I am a softy when it comes to Clark's upbringing and him learning to control his powers as a young boy and talking with Ma Kent and Pa Kent are the strongest scenes in the film. But here is the thing: I felt absolutely numb by the action. If it were even 10 minutes shorter it would have been a stronger film. But right now as it stands with one viewing, I feel kinda numb by the experience. Once the battles start, it's cool for awhile, but seems to lack the soul that the beginning half of the film portrayed. Just a lot of CG destruction that never felt real to me.
I would also say the editing needed some work. Either that or the film restructured. Personally, I know most people are not fans of seeing his origin again, but I think the film would have played stronger if told in a linear fashion and not the flashbacks, with more time on his childhood. They did not feel as organically entwined as the flashbacks from Batman Begins. That film felt like the perfect balance of flashbacks helping the narrative. A couple of these felt clunky in the way they were presented in the context of the ongoing narrative. But the flashbacks are so strong that they are absolutely essential. I think a better way to do it would to just show what happens from the time he is a boy in Kansas to travelling the globe told in a linear fashion, but then people would have complained of "too much origin! Get to action!!!"