The main reason I never got into Pern fanfic was that when I sat down to think about what I'd do with a Pern fic, I realized that what I like about the series is...well...the dragons. The world itself, the society she's created, is as thin and uninteresting as painted cardboard. Think about it: one monolithic, generic-quasi-feudal society with one language and no imagination. Plus some really, really skeevy gender, class, and sexuality subtext.