As the previous book ended on a massive cliffhanger, this book started of in an epic battle, so it was boring already from the start. The rest of the book felt like tying up all the bits and ends and I was bored.
It is probably more in the eyes of the reader than the book as events did happen, it's just that I felt done with the series.

In the first book I loved how the relationships between characters influenced how the characters acted, in the last book it felt to me like the characters did the only thing possible regardless of who they had been in order to solve the doom and end the battle.