Well I enjoyed it but I am a bit of a zombie / end of civilization fan.
I felt it was more a homage to zombie films / books rather than an entirely new story. I thought that there were so many bits taken wholesale from Romero's films / 28 Days Later / World War Z that it was almost a montage of 'best bits' . Then again I watch read anything about zombies I can find.
One thing about zombie films: all the "normals" always start from a point of ignorance about zombies. Why doesn't anyone ever say "What we need to do is x, y, z, like on "Dawn of the Dead", or in "World War Z". Conversely they always make the same stupid mistakes: someone should say, "Don't try that, so-and-so tried that in x film, and they got eaten by a zombie". One of the characters was obviously aware of the original version of "Night of the Living Dead" as he quoted, "They're coming to get you Barbara" (sic).
I've thought about this too much, but I did enjoy it.