Yep. If "Superman doesn't kill" (or, this is a deliberate choice and an act of war, whichever) is never stated in any way in the movie, then therefore him ... doing what he does ... has the emotional resonance of a toothpick.
(Or, yet again, it's a movie only for comic book fans, which is just not enough. The reason I love the Iron Man movies is that they're accessible to everyone, and their emotional weight is set IN THE MOVIE, not as a callback to something else. (I'm looking at you, Trek.))
I checked out emotionally around the time Jonathan dies because, good lord, no.