One Hobbit Good, Two Hobbits Bad

[Sauron the White]

from WCH

In the three existing movies, when PJ & Co attempted to insert 'original' material they made up, it was almost without exception bad. I think that's a reasonable basis for a prediction.

Would you be good enough to fill us in on the standards of measurement you or others are employing when you declare those three movies as "without exception bad"?