I was more concerned with the world's greatest detective assuming superman needed to be killed sans any detective work, enacting a plan to kill superman, and then stopping because he learned that they both had mommies.
Plus, !@#$ Jesse Eisenberg.
If they wanted a Batman that was into killing people, they could have spent a few minutes in the movie to explain why this older more grizzled Batman had lost his way from the Nolan movies and was ready to off people left and right.
Did I mention !@#$ Jesse Eisenberg?