I found Snyder's Dawn of the Dead better than the original, but 300 was so bad, so so so bad, it made me angry that films that bad could get made and make money. This one is a hard call. The characters all look well realised, casting/costumes/etc. and the use of Smashing Pumpkins' The Beginning is the End is the Beginning seemed not just fitting, but a clever poke at Batman & Robin (which used The End is the Beginning is the End).
But I have to agree with John Hopkins, the graphic novel is not an easy story to bring to the screen. When I read it, it seemed like a movie transposed into a graphic novel, but using all the elements a graphic novel can employ that a movie can't. Making a movie out of it seems like going backwards.