I finally finished A Feast for Crows after three failed attempts. I had to force myself to get through the first third of the book, but I found myself really enjoying the later chapters. Although I greatly appreciate GRRM's ability to create a detailed and complex world through his writing, he does go a little too far in describing minor details of both character and place. Some of the details seemed more encyclopedic than important information that furthers the story. That said, the character chapters of Cersei, Jamie, and Arya were excellent. (minor spoiler) I also loved the reveal of the true motives behind the prince of Dorne's behavior; I was just as annoyed with him as the sand snakes were until the end of that chapter, which is what GRRM must have intended all along. 
 I've heard many state that nothing important happens in this book, but I have to disagree. A lot of important things happen, but again, a lot of the important bits get buried in the minutiae. Many people that aren't committed to the series probably won't make it through this one, but I feel it's worth the initial struggle.