The Good - Very fun mechanics, absolutely love the gambits. All the classes are recognizable adaptions from the 5E PHB but reimagined in a broken world. Easy and fast NPC / monster building system. Interesting races (called origins here) that give the player choice in crafting the unique creature they are. Great choices for art.
The Neutral - No setting. By default this book is a collection how-to's not what-to's. As with the D&D core books no assumed or implied setting is the default. Rules are given for surviving and perservering in a broken world, not how the world broke. Zombies, robots, aliens and multiple other threats are all included within.
The Bad - Really, really needs a few more editting passes. Numerous typos, a few mentioned but then not described gambits (think I counted 2).
Super enjoy this supplemennt. The group I'm in has two alternating games currently encorporating these rules - a lighthearted 5E version of After the Bomb, and a more gritty zombie survival game.