The Last Olympian starts slowly and Riordan has a great deal of information to share with the audience in a limited amount of time. Unlike many finales, Riordan provides a satisfying conclusion to the mysteries he established in the previous volumes. Luke's outcome was predictable, but satisfying. Nico and Luke's background stories have some common threads that are revealed and explained as the story unfolds. Hades and Hermes’ relationships with their sons become a very important part of the story.
Percy's human friend has an interesting destiny that becomes more predictable as we learn more of Luke's past.
Less is explored about Percy's background in this novel, but his relationships with his human and God families grow stronger. His stepfather comes to accept his half-blood son and Poseidon responds to his son's advice on fighting the Titans.
Percy's final wish is a culmination of the experiences of the half bloods he has known through the series. Zeus is not crazy about the request, but grants it.
This was a satisfying end to the series.
The first time I read this series in print form. I have really enjoyed Jesse Bernstein's audio version. While he read the complete Percy Jackson series, he is not the reader for the next book and he is missed.