there are lot of topics on imdb, where non book readers ask questions, and people answer ” read the books ” or in the book, it’s like the same but let me explain to you the details and why it makes sense ” .
To my opinion, if you need to read a book, or if you need someone to explain to you details from the book , in order to a non book reader to fully understand the movie, so the MOVIE FAILED.
The book is not to blame, only the movie.
For example, I watched the ender’s game movie, never read the book. I loved the movie, cried, understood the message, then went to the boards, to know what books readers felt about the movie. I didn’t have questions about the movie (story ) itself, because i felt like i got all of them in the movie but still went and spoiled myself about the book. In fact, all the things that were changed from the book, or cut from the book, didn’t change the fact i got the message of the story and didn’t make me fell like Without the book I wouldn’t be able to fully understand the story.
but if for catching fire, plenty non book readers are confused , or misguided about the characters’s feeling , relastionshis and plot and the only way for them to get on track is to explain them from the book, or read the book. for me , the movie is a failure.