In Pathfinder RPG,it seems like all polymorph does is duplicate the effect of other more limited shapechange spells. I know it was abused in 3.5 and was a rules headache with applying templates and advanced creatures or monsters from obscure sourcebooks. I,however,really liked the idea of assuming unorthodox forms,so i was thinking of reverting to a compromise between 3.5 and PFRPG. Nothing's concrete yet,but definitely requiring familiarity with said creature and possibly part of creature as component or focus.