I've been playing it lately. My sense of it is that it's a lot like Zombie Hunters, but instead of interesting characterization, a looming plot, and a well integrated setting, it's a lot of "pick up junk for barricading," "buy 9mm rounds," "you hit, causing 6 damage" and "Someone tagged 'The Syndicate Suxors' on the wall." This is all the boring stuff, and the game focuses on it.
Playing it more makes me think I was missing something - it's supposed to be funny. There's a lot of humor in it, particularly once you get to map 2 (which requires a lot of playing, admittedly.)