TERRIFIC!!! except for one thing...
Where was the inner dialogue??? Some of the best writing and details from this excellent Frank Miller novel series came when we heard Bruce Wayne's, Clark Kent's and Jim Gordon's thoughts.
The film had one moment when early on Bruce was tormented by the Batman's voice before the bat crashed through the glass. So the idea of hearing inner dialogue would have worked fine.
Having read the novel a multitude of times, I knew what the characters were thinking, but if I did not read it, I would have missed out on some key elements.
Example... the nuke exploding ("Twenty million die by fire if I am weak") and Superman turning into a zombie like figure ("Though I was born a galaxy away... I have always served you")... It would have served the film better to hear Superman's thoughts about how he felt about Batman, his crusade, and how he never agreed with it ("We must not remind them that giants walk the earth").
Or Batman in the stairwell just before he kicks a gunman and his thoughts are, "There are 7 working defenses from this position. 3 of them disarm with minimal contact. 3 of them kill. The other... Hurts!" Finally, just hearing Bruce get angry with himself because he is older and not the man he once was and calls himself, "old man, senile, weak... etc" as he fights to get a strong sense of his frustrations.
The film did try to incorporate the inner dialogue a several times by having the characters speak it out loud to get story plot points across, but it needed more. Much more.
Overall a terrific rendition with one small flaw that would have made this film incredible.