I really like the Pathfinder setting of Golarion. It provides a large number of different roleplaying styles from high fantasy to swashbuckling pirates to suspenseful horror. Pick an area of the world and your gaming group can try something new for every campaign. As a bonus, the amount of information out there for Golarion either from Paizo, third parties or fans is astounding which makes it quite easy to prepare for a campaign or even a simple adventure set in the world.
That being said, there is one main thing I don't like about Golarion. Most if not all of the sources of information provide mechanics for Pathfinder RPG. I've played plenty of Pathfinder RPG and it certainly has been fun in the past, but the current amount of system bloat makes it very hard to sift through what you need for a campaign and keep it balanced. This has lead me to do some serious thinking as I contemplate my next campaign set in Golarion.
