I saw the Sin City sequel last night. I don't even know why they bother. I saw the first one and yeah it was something new back then but ever since Frank Miller's stuff has been adapted for the screen and have failed. I had heard that a lot of scenes didn't have all the actors together filming. Maybe because I heard that beforehand... it did look like the actors were talking to themselves. I should've watched Expendables 3 instead.
Frank Miller is currently a mere parody of his formerself. As one comic reviewer stated succinctly -- "Frank Miller never stopped writing Sin City". One merely has to look at All Star Batman and Robin and Holy Terror to see how low he stooped.