I hadn't thought of it like that before but a modded version of a RPG is exactly how both the Pathfinder games feel like to me, they are like some of the modules and mods for Neverwinter Nights and BG:II I've seen, they're suped up versions of the basic game that use every trick in the book to beat you because they assume only old-hands are playing, and also they're hardly playtested so a lot of what they think theoretically works doesn't fair well.
