I'm going to be the dissenting voice here. While I thought it was good, it wasn't OMGTHATWASFREAKINGAWESEOME! The effects were good, the acting was good. But at one point, I'm sitting there thinking "I could probably fall asleep right now." I did like the nods to the original movie and the original series. But overall, nothing really got me excited, except for the jokes.
"You need me. You wouldn't be much of a hero without a villain. And you do love being the hero, don't you. The cheering children, the swooning women, you love it so much, it's made you my most reliable accomplice." -- Lex Luthor to Superman, Question Authority, Justice League Unlimited