What bugs me about that line is that it only holds significance for those familiar with the rest of Superman and the comic history. Without that context, the next movie could just go in with batman and superman having this rivalry, fighting, having batman win, then saying that line.
At which point, anyone only familiar with the two movies will be asking, "Wait, what? So? Superman's beaten just one guy so far anyway, that general dude. So the second guy he fights, batman, beats him. So what? That's just 1 for 1, big deal, lolz."
That was kind of my problem with Man of Steel as well. It spent so much time showing hundreds, possibly thousands dying, at two ends of the planet while Superman goes off and saves Louis Lane who's conveniently everywhere at all times. Okay, so Superman had a lot on his plate, but there's no scene where Superman even acknowledges or laments those other losses. Then at the end, Superman is crying and shouting about 4 other people in the train station that Zod tries to kill directly. What? Is this the same Superman that just bashed Zod through a skyscraper, some buildings, and blows up a 7-11, all in straight line, without even considering that there might be other people in those places, just because he was angry at Zod?
Don't get me wrong, I give these issues a pass because I think they're trying to establish that this is why Superman later tries his hardest to avoid casualties and is repulsed at killing. I just think that the recent crop of films can rely a little too much on prior knowledge for really critical plot points or story elements. Same with "Into Darkness" and Khan, etc.
That said, overall, I am still looking forward to the next Superman and Star Trek films.
![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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