Magazine Keeper

It was the movie "My Sister's Keeper" good?
We were going to see in the movies, because my mother read the book, but People magazine, which rated it 1 1 / 2 stars. Is it really so bad?
Two of my friends read the book – I loved it …. but when they saw the film, were both disappointed and upset. As I have not read the book … and my friend's complaints about the film (especially at the end) … I will avoid the film and just read the book. Why ruin a good book?
“Keeper of the Pinstripes” on “Yankees Magazine”