I am surprised that the rating is so high for this book. I personally hate jumping timelines... with a passion. But that's not why I disliked the book. It's telling many stories but there really isn't a plot, if that makes sense. It's more of an "a day in the life of" type story.
Also, when the big action moment happens it's a let down since there is a absolutely no way you could guess the who and the why. And the ending! Don't leave me guessing. You're the writer, finish your story! I don't want to have to guess a character's actions when a book is done. I want to be able to judge them on what they actually did!
The way that the story is told (first person), the narrators have MANY questions that they don't know the answers to, and in return, the reader never learns the answers either. That's annoying.