Copied and pasted from the Rate and Review Thread:
To be perfectly honest, I thought this film was a mixed bag.  On the one  hand, I think the cast was top-notch; Henry Cavill mad for a decent  Clark Kent/Superman, as did Amy Adams as Lois Lane, Michael Shannon did a  great job as General Zod and, while still hammy, gave him a lot of  depth.  And Russel Crowe as Jor-El kicked all kinds of ass even as a  hologram.  As did Antje Traue as Faora.  In terms of visuals and  cinematography, it looks incredible (as if the trailers left any doubt)  with some great special effects--particularly whenever Superman was in  flight (and having him float up whenever he fell as opposed to just  standing up normally?  Brilliant!)  And those fight sequences?  Pure  comic book goodness, which Zack Snyder delivered in spades.  You  literally could feel those punches and shock-waves as you saw them on  the screen. 
Unfortunately, when it comes to story and characterization, the film  winds up being a complete and utter mess just like Smallville and  Metropolis end up in the film.
For instance, that opening sequence on Kyrpton is gorgeous and very good  sci-fi fantasy (even though it's basically Dune, Prometheus, the  Matrix, and the Star Wars prequels mashed-up together) which I found to  be quite intriguing and had good pacing.  Problem is it's nothing more  than a 20 minute prologue which could've been cut completely out of the  film and you wouldn't have harmed the film in the least, especially  since hologram Jor-El proceeds to explain and show Clark pretty much  what we just saw at the beginning of the movie.  To me, the film  should've opened with Kal-El's ship crashing on the Kent farm, and we  should've seen the scenes on Krypton and it's eventual destruction when  Jor-El explains to Clark where he came from.
Also, while I believe Kevin Costner did a very good job as Jonathan  Kent, I thought his depiction in terms of the script was awful.   Granted, I get that Pa Kent wanted to protect his adoptive son and I do  think his belief that the world would be more inclined to fear Clark  makes sense, but the message he teaches Clark amounts to "It's better to  keep yourself safe and protect your secret even at the cost of other  people's lives" which is a horrible message for a parent to teach their  kid.  Not to mention it contradicts him also telling Clark that he was  sent to Earth for a reason and that he was going to change the world,  cause that means Clark revealing himself to the world eventually,  doesn't it?And besides, Clark goes against his dad's very advice  when he saved the workers on the oil rig.  Oh, and don't get me started  on Pa Kent's death scene with the tornado--not only did I think it was  cheesy instead of poignant, the circumstances leading up to it do not  make a lick of sense (seriously, who stops their car and gets out of it  during the middle of a tornado?  Especially since Kansas is tornado  country?)
Likewise, while it's understandable that Zod wants to save the  Kryptonians via the Codex, The World Engine really serves no purpose  whatsoever other than to be set pieces for the climax.  Think about  it--Zod and the other Kryptonians, just like Clark, have superhuman  abilities on Earth due to it's lower gravity, yellow sun, and  atmosphere.  By terraforming the Earth to be like Krypton, they  essentially are giving up their opportunity to be literally a stronger  race, are they not?  Oh sure, there's initial pain and discomfort due to  sensory overload, but we see they'll be capable of overcoming it in  time, and any new Kryptonians who are born will become acclimatized like  Clark did. (EDIT: Although, it was pointed out to me that the World Builder IS the most efficient and fastest way for Zod to get rid of the people of Earth, so there is that).
And as great as those fight scenes were, Superman really doesn't seem to  pay much attention to all the collateral damage and the thousands of  lives that are lost as a result.  (Yeah, telling the people of  Smallville to get off the street and seek shelter in buildings is going  to do a fat lot of good while you're being punched and thrown around in  the buildings there, Supes.  And I sure didn't see you act the least bit  upset over the fact that the town you grew up in was just virtually  destroyed.)  There's even a point where Superman and Zod are taken out of  Metropolis and into orbit--thereby possibly preventing further  destruction and loss of life--only to come right back down to Metropolis  again.
That, of course, leads to the now infamous scene of Superman killing  Zod.  Sure, we're supposed to understand that he had no other choice and  was in anguish about what he was forced to do.  Problem is, Superman  shouldn't have been in that position in the first place since, as I  said, he already had Zod out of Metropolis beforehand only to come right  smack down into the city again.  Also, didn't he think about diverting  Zod's face away from the family or covering his face?  And how did Lois  know exactly where Superman and Zod landed?  Also, given the emotional  gut-punch the scene had, having the next scene with Superman returning  the drone be more or less light-hearted feels like emotional whiplash.
I know it seems like I'm really being harsh on this film, but again,  there were parts of it I really liked.  I think the idea of having  Superman's origin be akin to a first contact/alien invasion story was  clever, and I really liked how they told Clark's childhood via  flashbacks.  It's just once Clark put on the Superman suit, that's when  everything about the film started to fall apart until logic and common  sense was completely tossed aside for mindless spectacle.  If the  filmmakers had paid more attention on getting the script right as they  obviously did on the visuals, this could've been a great film instead of  an okay film with occasional, but far too few, moments of brilliance.