This is NOT a terrible zombie flick.
I enjoy most zombie movies (even a lot of the bad ones.) But honestly this isn't a bad movie as horror films come. I actually enjoyed it, and would have been interested in seeing a longer version.
You could obviously tell it was a tight budget, and there was a lot of CGI and what-have-you. But I believe, overall, that the director/cast really did well with what the have (and the subject matter isn't exactly serious.)
I also enjoyed the humor/horror references peppered throughout the movies.
Go into this knowing it's a low-budget zombie film, and you shouldn't be disappointed.