Before I address anything else about this series, I have say, Robert Kirkman? You have some issues when it comes to women. Thusly, you can't write women accurately. At all. The female characters in this series are either bitches, sluts or nagging harpies (or some combo of the three) who just wanna wash clothes, sew, have babies, fuck men, and maybe, in a completely out of character move, kiss another woman. Also, the children in this book are like Disney show characters, ridiculously blinking up through all the carnage with Kewpie doll eyes. So cliche and so unrealistic. Also, the dialogue is terrible. Cliches, out of character moments, stereotypes, non-sequiturs, every writing rule is broken, and not in a good way.
This all being said, this is an amazing GN series. The base story is fantastic. The realistic reactions of people under unbelievable amounts of stress make the tension palatable. Happily, the TV series adaption has fixed a lot of my aforementioned issues with character and dialogue to take this story to the level is deserves to be at.