I think it's a must read regarless how you feel about it.
I really liked the story. I think he took the next logical step. He realized beating up muggers and thieves was pretty useless. THe only way to fix it would be on a global scale.
The Robin thing I think was just a funy idea he had and he knew it would stir up the fanboys. He loves stirring up the fanboys!
The art I really didn't care for. His art has always been in a state of flux depending on who was influencing him at any given time.
The Ronin era was Moebius and Goseki Kojima. Sin City was his B&W experiment. DKSB was very cartoony. Too much for my taste but the thing with Miller is if you don't like what your getting now, hang out, it will change again and you might like that a whole lot!