In general, I’ve found the player’s guides for the various adventure paths to be of mixed quality. Some do the job or preparing PCs for the adventure path to come quite well, while others are not so good at it (and sometimes even seem to create a false impression). One of the problems is, how much information is too much to give to the players before the game even begins? Different gamemasters will have different views on this, and satisfying all of them is a virtual impossibility.
As lukewarm as I feel towards the Shattered Star adventure path, the Shattered Star Player’s Guide is one of those that does its job well. Like most of the player’s guides, it’s short (12 pages total including cover and title page—so really only 10 pages), but it’s filled with information that is useful for the campaign. It begins with a few basic tips, then moves straight into the campaign traits. It doesn’t spend much time on how the different classes and races fit in the campaign (like many of the other AP player’s guides do), as there really isn’t any need for that in Shattered Star. It draws attention to the fact that the campaign is focused on ancient dungeons and so suggests that characters with mounts or animal companions might find large animals a liability, but that’s about it. In dungeon environments, there’s little else about any one specific class or race that stands out or needs discussing.