It's definitely the same formula we have all seen over and over - a disease has ended pretty much all of civilization and the few survivors have gone feral yada yada. This time though, the "disease" is a living entity that shifts and mutates and has nasty teeth.
Not for the faint of stomach, the imagery here is VERY bloody and graphic and brutal. Lots of blood and guts and yuck. Also some boobs.
One nice touch though is that the ass-kicking hero here is very quietly gay, and the book doesn't make this a big deal, just sort of throws it in there under the radar very neatly. I thought that was cool since there are so few portrayals of super tough gay men in literature, let alone in graphic novels