From my post in the "second viewing thread":
When Superman has Zod in a chokehold and is begging him "don't do this!", you can truly feel the weight of his dilemma - save the people he loves or murder the last remaining member of his race. Bruce Wayne's denouncement of killing makes sense due to his personal loss, and kudos to Goyer for having the balls to put Superman in such a position where his decision will form his code of cherishing life in a manner that means just as much to him, if not more, as it does to Bruce Wayne.
The more I think about the best parts of this film, the more I love them. Superman may not have many great villains, but the character himself can be portrayed in so many beautiful and profound ways, I find it baffling that people deem him to be boring and uninteresting when he is actually the exact opposite. The ineptitude of the writers who fail to realize Superman's narrative potential is irrelevant to the merits of the character itself.