The pros of the Players Guide are entire lists of smaller, more obscure, things. In addition, the information on the Guide is all in one place. The cons of it are incompleteness, lack of greater details, and the fact that players cannot contribute to it.
The visibility of the Players Guide is more or less the same as the visibility of Oberin Wiki. Both databases are linked to in the Navigation sidebar on the main Oberin website. The only difference between the two links is that the one to the Players Guide is in boldface, while the one to Oberin Wiki is not.