This is the fourth Christopher Moore book I've read, and with the exception of Lamb, which I loved, the other three have evoked much the same reaction. I enjoyed them, I was mildly amused, occasionally laughed, but was left without passion for the books. (I often have the same reaction to Terry Pratchett, which may earn me no friends at all.)
I do enjoy them! I will probably pick another up at some future point. But I'm in no hurry to do so. When I do get around to it, I'm sure I'll enjoy it. But I don't love his books. They're excellent light fun, and sometimes that's what I want. But when I think about picking up another, there's no urgency. There's no little voice in my head saying "You know what you want to read right now? How about some Christopher Moore?"
But who wouldn't love Christmas zombies?
I also haven't read most of the books that this book draws on, so maybe that's where I'm missing some of the fun. But most of the characters are drawn clearly, if superficially, enough for me to keep up all the way along. And I love the fruitbat. And the dog. And mostly enjoy the Warrior Babe.
And definitely the Christmas zombies. And their IKEA obsession.
So if you're looking for a light, enjoyable book, this is it. It's a fast read, and a funny one.