I watched it last night, and aside from almost being sick at the brutality within it, it truly is the most hard-edged and realistic Comic Book movie ever made.
The look: It couldn't have looked better. It really couldn't. Everything was there. You could take any screen-shot from the movie and just stare at it for hours and never find it boring.
The opening credits: I read a review which said, "The opening credits held more of a story than the last three Spiderman movies combined" and I agree. It was fantastic.
The action: Ok, so I was almost sick watching the scene with...er...the saw, and also the bit with the, er, Dogs...But that's because I didn't expect to see those kinds of scenes in there (I hadn't read the book.)
The story: Oh my gosh...wow...Retired Superheros...My heart stops at how good they portrayed them.
One of the best moments, for me, in the whole film was when one of the characters turned up at the other's house and says, "I didn't have anywhere else to go. I only know heros."
And it ocured to me, this is how Wonderwoman of Superman will be when they get old and forgotten...It stuck with me to hard.
However, my fear is that all Superhero movies from here-on will try to be Watchmen...