| Maleficar |
So what's the consensus? How many DMs out there feel the feats from that book were just too much to allow into their 3.5 or Pathfinder games? As a side note, how many DMs out there limit their Pathfinder games to Pathfinder feats only?
As for the last part of this question.
I would have to say that every setting, Demands creativity and every setting is 3rd party friendly. Why else would they have unexplored continents... If not to have a way to introduce new races! New magical formulae and methods of casting, prestige classes, Class Variants, and feats?
I'd have to say that pathfinder itself encourages it. As every region is a setting unto itself. Never wholey defined but always hinted at. From Gothic horror campaigns of Ustalav. To the techno savvy wizardry of Numeria. Kingdom building in the River kingdoms?. Pathfinder was created to absorb 3.5 previous publications not dismiss them, and every region is a style of play; or simply an extension of your style. A way to introduce the 3rd party content pathfinder hasn't written anything for.
Before pathfinder my main setting was the Forgotten Realms. But across
the trackless sea, south of Maztica rested "the continent" a land of men and darkness. Where ancient evils walked just beyond mortal perception; and a little city of pirates called Freeport nestled off its cost. Zakhara become its Hamunaptra.
And so my realms joined with Green ronin's mythic vistas and Freeport setting. (A little tweak to the timeline and it fit effortlessly in)
I think every region had a style in mind. More D20modern/spelljammers would find Numeria more comfortable. While those lovers of Call of Cthulhu, Ravenloft, and Freeport settings would find Ustalav more to their liking.