I was in and out of this. Part one I liked but was kind of bored. Part two gripped me. I got lost in that part. Then part three I went back to how I did in part one. 
I can't really put my finger on what it was about those parts. Maybe it was some of the POVs. Geoffrey for example did nothing for me. Some side storylines felt irrelevant and took me out of the story a little. 
Part one and three lacked the excitement and intrigue that part two did. Part two felt so much darker and more intense. 
The twists, especially the who done it, felt predictable. It played part in taking out the excitement intrigue from the story as a whole. 
I listened to the audiobook and had no issue just listening despite it feelings a little dragging at time.