Having seen it once and read a great many of the negative reviews on Rotten Tomatoes, I'd say that A) the movie is not *quite* as good as
The Dark Knight, but if
Dark Knight is your bar, there's no shame in missing that bar by a small margin...
and B) most of the negative reviews get incredibly didactic in their attempts to explain why the film "doesn't work" (the critic on rogerebert.com claimed that Zod's primary female lieutenant pathologically hated all men, something made up right out of thin air); most of them also seem to insist that Supes can't be taken seriously as a character and that all a Superman movie should aspire to is yet another revamp of the Christopher Reeve flicks, 35 years later. This isn't even worth dismissing, as they've obviously never picked up a comic book. Anyway...
I saw no inconsistencies vis-a-vis earth atmosphere/air/Kryptionian air and the granting of superpowers. To those who've argued the topic back and forth until they're bored with it, I'd suggest that you're overthinking it. Earth's "younger" atmosphere gives Kal-El superpowers; makes perfect sense. When Zod and his men take their masks off, they're overwhelmed in the same way that we see young Clark overwhelmed in the schoolroom scene. Outside of Earth's atmosphere, Kal-El becomes weaker; Jor-El adjusts the atmosphere and he's back in business. Of course the Kryptionians wouldn't suddenly gain superpowers when a hole is blown in the ship: they're still outside earth's atmosphere.
I loved the scenes of Clark first pushing his limits and learning to fly: have we ever seen Superman LEARN TO FLY before? Have we ever seen Superman thinking, "man, flying is COOL!"? Certainly all Brandon Routh ever did was adopt a mystically contented attitude as he toted Lois around in the air; if Christopher Reeve ever did anything more than the same, I certainly don't remember it.
I loved the new music. I loved Cavill's performance; I thought Diane Lane was pitch-perfect. Costner was predictably great. Amy Adams' Lois was light-years away from the silly goofiness that Margot Kidder portrayed, and that's just as it should be.
And I really never felt less than engaged during the fight scenes. Yes, there's mass amounts of destruction per minute in the final half hour, yes Superman doesn't save everyone, but please stop assuming that he's obliged to -- this is an origin story and if you can't allow room for growth and change in your own conception of the character, then yes, you're going to be bored.
And finally, I absolutely felt that the film took the right tack in emphasizing that Kal-El, his father, Zod and the others are ALIENS. The strength differential is indeed that between men and gods. This dichotomy was not forgotten even in the final action sequences, which moved back and forth between Kal-El's actions and Perry White on the ground, trying to get a reporter out of the wreckage with a crowbar.
I urge anyone who felt disappointed or annoyed by the film to read the review below.
http://wegotthiscovered.com/movies/man-steel-review/