I prefer science fiction, fantasy, and horror without the spaceships, dragons, and zombies.
Compared to John Does at the End, the structural problems here are minor. This actually reads like a novel rather than the world's worst 'fix-up.' But, sadly, this wasn't as zany as the first and it didn't have nearly the number of crazy gags, mysterious world building elements, and good humor per page as the first book in this series. It had a promising start but resigned itself to be one extended zombie joke for much of its page count. Thankfully, the last 25% was a return to form and was satisfying enough for me to consider picking up the next in the series at some point after its release--but not on day one.
If you've read the first book and haven't picked this one up yet, think of this one as Dave and John getting dumped in the Resident Evil film universe. If that sounds great, pick it up. Or, if you like zombies and dick jokes, give it a go. You won't be disappointed.
Full Disclosure: I'm not big on zombies.