I liked it
Can of Worms doesn't skip over the days where there are no monsters to kill, because at this point the story isn't just a combat log of who killed what. Oh there is plenty of action and violence. The Zombies are getting smart, -using guns, driving cars, getting strategic. There are giant monsters a plenty, and human threats, but that's not all this is about. There is balance between the bloodshed and the developing relationships between Alvin, Gothy, Mousey, and the other one who's name I keep forgetting, uh, the short one.
Some folks have complained that the base building stuff could have been skipped over or montaged into a fast forward or a flashback footnote, But I'm glad it's in there. It gives the over all effort a larger since of scale. anyone who has ever tried to drive across Texas can tell you, it feels much like that, it it takes days.
The only complaint I can muster is that Alvin's asshole nature which has been mellowing over the last two books is back up to book 1-2 levels and felt a little jarring at times, but what-cha-gonna-do. dude is big hearted for a cold blooded mercenary.