Man of steel is by far one of the worst comic book adaptations in cinematic history, not including green lantern, cat woman or Iron Man 2.
Bad writing
Cheesy and extremely stale/unoriginal story
Louis Lane could have been much better
Henry Cavill had the looks for a good superman but was
absolutely mediocre
Superman killed someone, which I never remember him doing, ever...
If this movie didn't have the popular superman logo to fall back on, it would have been forgotten by now