I liked it more and more after repeat viewings. I've narrowed down my gripes to following
I don't think the plane sequence was ever topped. The result of this imo does have a bit of an effect on the pacing of the movie.
Another thing, we should have seen something that happened in space within those 5 years other than finding out Krypton is a graveyard. Such as another solar system, maybe a planet where he has to fight his way off. Put him in immediate danger at the start of the film. I just think knowing there is a 5 year gap and not seeing any of his adventure is a mistake.