This is a series that I read mostly for the robots, although people tend to call them 'warbots.' And they are just that, meant to fight off the zombie invasion. I forgot that I was reading out of order, and that this was volume two, but the story was cohesive on it's own, although I'm sure I missed specific incidents they referred to: the editor's notes told me which issues I missed them in, after all!
Other than being fine as a stand alone, this was a lot of fun. The series doesn't take itself too seriously, for one thing, although it does focus on telling a fun story with solid characters while poking fun at itself in how ridiculous this whole thing gets.
The art is lush in its painterly scope, although not color wise: muted colors reflect the horror of the world that's been created, adding to the creepy sense of this whole thing, adding a sense of gravitas that was, on occasion, missing in the writing. Not to say that 'missing in the writing' was a bad thing; I liked how flippant this could get despite the desperate situations. Not only that, a more serious art style - like the toned down color scheme - and the outrageous elements in the writing ended up matching up perfectly, one keeping the other in check.
It felt neither too serious, nor too silly, but ended up a balance of both that simply appeals to me. I'm looking forward to catching up on volume one, since I ended up getting both on sale along with the Undercity volume and simply ended up reading out of order...