Well, I finally finished the Percy Jackson series. It was just okay for me. 
 Percy did seem to be slightly more mature in this book, which is an improvement over the other four books in which he pretty was the same kid at the age of 12 as compared to his 15-year-old self. That was one of the things that annoyed me throughout the series. I wasn't expecting any dramatic changes but there should've have been some change, however small. 
 Anyway, the mythology element was really interesting, and it turns out that Rachel Dare, who appeared in the previous 2 novels, is the new Oracle of Delphi. All of the minor Greek Gods get cabins at Camp Half-Blood, Mount Olympus is rebuilt, and the gods are going to recognize all of their children by the age of 13. 
 The most surprising thing was that Percy turned down the chance to be a god, instead asking that all children of the gods get recognized, and that everyone gets a cabin at camp, as well as asking that they free those titans who are innocent. It was bold, but they agreed to it. I wasn't expecting Percy to turn down the offer of godhood, but he really does want to be normal (even though he's not). 
 The one thing I could see coming was a prophecy given by Rachel near the end of the book. The one thing that popped into my mind was that he's totally setting it up for another series involving different campers, possibly with some of the characters from this series in the background. Plus, Percy and Annabeth finally get together. That was also really obvious, since it was totally set up since the beginning. 
 It was a slightly disappointing conclusion, but relative to all the other books...it worked. Kind of. It could have been better. 
 Despite the fact that this book was slightly disappointing, it gets a 3.5 out of 5. There were things I liked, and the mythology is most of why it got a 3.5.