For me what gives TWD an edge is the
whole notion that everyone is infected anyway, this is the factor that essentially makes any long term hope for rebuilding civilisation quite tenuous. You don’t just have to worry about the zombies outside of your walled township, you have to worry about all the healthy people inside the compound because everyone, including yourself, is a potential fifth columnist. You can kiss your wife goodnight and be woken two hours later when she’s gnawing your leg off because she had a heart attack in her sleep. Little Timmy and his friends can be running around a deserted building having a right old time, till Timmy trips down the stairs, breaks his neck, and next thing you know he’s a zombie, and likely pretty soon so are his friends.
Now imagine this in battle, you not only have to worry about your fellow soldiers being bitten, you have to worry about friendly fire too (and the impression is that this wasn’t common knowledge in TWD universe) as well as accidents and disease. Especially in the early days I wonder how many (non-zombie bite related) wounded soldiers were carted back behind the lines to medical facilities where they subsequently died and turned?
I liked WWZ much more than I expected to, though I did find it ironic that I wasn’t allowed to see Pitt bludgeoning zombies' heads in in a 15 certificate film in the cinema, when I can see Andrew Lincoln do it on the telly!