I agree with Hellfireboy, I don't get this review or the others that call the movie "joyless." I feel like half these reviews are just quoting and agreeing with each other without actually having seen the film. It's like they watched a bunch of trailers half-asleep, read some reviews, and pretended they saw the whole thing by writing a bunch of stuff that ultimately is vague and just echoes what other vague things other writers wrote.
There are definitely aspects of the film where things are to be taken seriously -- but really, what the movie takes seriously is the idea that this man, Kal/Clark, realizes he's unique on earth, with special gifts, and is trying to figure out who he is. The iconic, classic heroic journey to self-discovery might by highly mythologized in Superman, but it's a story worth telling over and over and the movie does it right. And it does need to be serious to an extent to be told well. The elements of Superman's backstory ARE serious--it begins with the death of an entire planet and its people. It's been like that since his inception. Are we supposed to make light of that? Are we supposed to not think about what kind of impact that might have on the story of that world's last son?
At the same time, I don't feel the movie overburdened itself with "grimness" -- to me it utterly avoided the "Grimdarkness" I was afraid it would fall prey to. Just because a movie makes appropriate moments serious does not mean it is wallowing in "grimness." There is some great dialogue, and as for humor, many lines throughout the film that made the entire (very large) audience I was in laugh out loud several times. This isn't the best example but off the top of my head, for example Lois's answering Superman's explanation of the "symbol of hope" on his shirt. "Well, here it's an S." Lots of cute moments too--many of them with Pete Ross, Clark's glasses showing up halfway through, and so on.
I also loved the kindness and compassion Clark had (and I loved how much it caused him pain to do what he had to do at the end in the final battle), and I loved that it was shown that he WORKED to develop that kindness within himself. I loved that they did not make him some same-old vengeance driven superhero all the cool kids like to watch. I loved the warmth in Ma and Pa, in Jor and Lara. I loved the teamwork and regard for each other--complete with teasing--that the Daily Planet had, who were far more than just a "requisite" b-plot, they were real characters, and I remember holding my breath as Perry and his team tried to save the trapped intern as much as when Superman was trying to shut down the doomsday device. Skip through the special effects moments, and much of the movie is very much about the bonds of family, and what constitutes a family (e.g., Superman's birth family, his adoptive family, Lois's "family" of co-workers at the Daily Planet; even Zod and Jor had an "estranged brother" feel to their conflict even though they were not related). They told this story well, and telling a story well about families requires a deep understanding of warmth and joy...
... which leads me to think that the movie's writers have a much better sense of these things than MovieBob and the other hater-reviewers ever will.
I don't really get what MovieBob wanted or expected out of the film in lieu of what was produced. Slapstick? Luthor in a toupee dating Parker Posey? Out of place antics by Richard Pryor? 1940s gags about women in the workplace at Lois's expense?
I wasn't going into Man of Steel expecting comedy or tomfoolery. I went in to see a retelling of the classic heroic epic. I got that and then some, with a story of a good heroic man with a lot of self-exploration and heart -- yeah, some of it occasionally got drowned out by the over-long fight sequences that dragged out toward the end, but you can't have a movie like this without gratuitous explosions these days. Even with the fairly minor issues the movie had, they must have done something right, because I left leaving the theater not only grinning, but feeling like I could fly.