She is objectively bad at her craft.
A lot of times people think writing is bad simply because they don't like it. This is not one of those cases. She is objectively bad at what she does. I have near my desk a well-thumbed copy of GWW guide to writing fiction, and every single chapter could be followed with excerpts of her scripts as examples of what not to do.
A lot of people liked the Hobbit movies, but they don't realize that they liked them in spite of Fran's contributions, and not because of them. Most people who enjoyed those abortions don't have the slightest inkling of how great they could have been had the story been given a proper treatment.
Fran is by no means the worst writer in the history of writing, but she's certainly the worst of all the writers to be given the opportunity to write on such a big stage for such a big audience. I hope Peter has some really nasty bedroom habits, because she better have earned this.
goat