The Gamer's Guide has two main goals. First, to cogently illustrates all of the main genres and sub-genres that are available for an enterprising tabletop RPG group. Second, to provide links to some of the leading games in each of those genres and sub-genres.
It succeeds in both goals! I was very impressed at the genre breakdown. For instance, in establishing "Space Travel" into a separate genre, the writers were able to show why Rogue Trader and Star Trek were both part of the same genre, even though from another point of view the two games could not be further apart. As I read the book, I found myself seeing new angles and ways to play I'd not thought of, just from how they presented the similarities and differences in different games.
I was equally impressed with the depth of the game suggestions. Not only does it cover the main games in each genre, but it includes really excellent but lesser known games as well, such as Warrior, Rogue & Mage; Thousand Suns; and Barbarians of Lemuria.
This is an excellent product, and well worth the $1.00.