I think mine’s Z for Zachariah. The book is insane. A psychological survivalist thriller between a 14 year old girl and a strange man with unknown intent. The movie is… not this. They changed everything meaningful about the characters and lost all the tension. Hope someone does it properly one day. What’s your adaptation peeve?
For most of the other responses, I had to see the movie to realize it was a poor adaptation. I didn’t even have to see a trailer to know for this one. A poster was enough.