Here's the thing with zombie films - they can be pretty solid, or they can be unbelievably crappy. A lot of amateur filmmakers set out to make zombie flicks because the initial setup is fairly consistent, and it requires little actual thought to create a framework for a narrative. Nearly anyone, it seems, can write a bad zombie film: take a bunch of characters, throw them into the apocalypse, add some gore, and you have a bare-bones approach the genre. This is why I don't envy Kay's job at compiling reviews of these films - there are way, way more terrible movies than there are good ones, and I don't think I could intentionally sift through them all without becoming biased.
Still, that's what Zombie Movies: The Ultimate Guide is for. Glenn Kay has sat through all of the really bad zombie films so that you don't have to, and he's also compiled a list of what he considers the best zombie movies of all time - and if this guy doesn't know, then I don't know anyone who does.
The guide is split up into years for easy access. If you're looking for something from the '50s, there's a placce for it. If you're into something modern, have a gander at that section. There's also a nifty index and an appendix with non-zombie films with zombie themes.
Kay provides very detailed reviews of each film, along with a symbol rating for each. There's the great, the good, the bad, the very bad, and the laughably bad. If I had to make an estimate, I'd say the majority of the films here are in the "bad" category. That doesn't mean that Kay's a tough reviewer, or that he's an elitist giving only the most popular movies the best score. It simply shows a normal ratio of horror films in honesty - for the most part, they're not that great, but there are standouts.
However, attempting to read Zombie Movies in its entirety like I did might result in a zombie hangover. There are so many reviews that it's best to use the book as a consulting guide rather than a fun and pulpy read. It's kind of like taking the encyclopedia and trying to read it passage by passage - the education might be great, but it's not necessarily an entertaining read.
Still, this compendium is such a huge and encompassing book of zombie media that you can't pass it up. Kay might be a sucker for the bad films, but he does have an eye for the best zombie flicks out there. I can say for certain that I have seen probably about 10% of the zombie films featured in the book. Now, I have another 200 to watch before I reach the esteemed level of Glenn Kay. And as of the writing of the second edition of Zombie Movies: The Ultimate Guide, there are a lot more for Kay to get his hands on. Good luck to you, sir, and may your brain never fall prey to the monsters you love so much.