I read this but I guess for some reason I never rated it? Until now. 
 This is the final book of the Heroes of Olympus series, a continuation of the Percy Jackson and the Olympians series, a set of books I loved so much as a child. And I really wanted to love this too, I did. But I couldn't. There were so many problems with it. Leo (need I say more?), the whole way all of the seven were downplayed (and many, many important plot points left unaddressed, like Frank's stick), the fact that the supposedly huge battle that the entire book series has been leading up to was started by (view spoiler)[Percy's nosebleed (hide spoiler)], and then said battle lasted only like ten pages (don't quote me on this; I remember it was incredibly short but I don't care to go back to check), and the fact that (view spoiler)[no one died. Like at all. I mean, Leo technically died, but then Rick Riordan took a cop-out and summoned him back to life. I personally thought it should have been Jason to die, even though he's my favorite. I mean the way he was torn between the two camps, totally unsure of where he belonged? His loyalties were split, and he would be the perfect one to bring them back together. His death would be a wake up call to all the demigods and they would all realize that Gaea was the one they should really be focusing all of their efforts on, not each other. (hide spoiler)] 
 The only redeeming quality was the inclusion of the Nico and Reyna chapters. But as much as I loved them, with already seven other main characters, it's kind of pointless to focus on them and their drama without drawing away from the main adventure. I would've loved a short story/novella being released afterwards from their points of view though, because their chapters deserve to be appreciated. 
 tl;dr: I am disappointed in this book, I wanted so much more, but Nico and Reyna were a nice touch.