What was the greatest thing about Dark Knight - the most "faithful to the comic" Joker, Batman, and Two-Face ever seen.
What was the worst thing about Superman Returns - An entire movie full of things that were not faithful to the comic, but where instead faithful to a 1979 movie with random modern updates out of left field.
The pressure better be on, and the fix is simple. Reboot. Get a guy that looks like Alex Ross painted him. A big, strong, wise Superman. Make his enemy someone iconic from the comics and do him faithfully.
You will have millions of dollars and the goodwill of fans. SIMPLE.