I like The Walking Dead a lot too, although I'm not sure how long they can keep up the "everything 100% FUBAR 100% of the time" scenario going and get away with it. The acting and effects are top level though and it certainly keeps your attention. I think I like Z Nation a little bit more than Walking Dead though, mostly because they don't take themselves as seriously. Also good acting, good effects, and a completely messed up situation, but then there is suddenly something, usually gross and gory, but also totally funny, to laugh at.
I try not to get too invested in TV shows, though, because my favorites always seem to get cancelled. I just read that Perception was not renewed. I am sad.