** spoiler alert ** 
 I shall do this in the classic plus/minus fashion. 
 + Excellent homage to Achilles and Patrolocles from the Iliad with Clarisse and Silena. I saw it coming, along with the identity of the spy once Silena ran off, but still wonderfully handled. From the armor to the dragging of the drakon, it rocked. 
 + Love the backstory behind May Castellan/Hermes as well as Hades' backstory. Poor Hades. I knew I loved him for a reason. I also love Hermes. 
 + Love Tyson finally getting to fight and make his Daddy proud. 
 + Thalia just being fucking awesome. 
 + Rachel Dare in general but particularly her turning into the Oracle. 
 + NICO. His dream, his coming back for Percy, his forcing Hades to fight. Love. 
 + Great execution of the prophecy. 
 + Annabeth's showdown with Kronos/Luke. 
 + Cameo by Mr. D. 
 + Percy forcing the gods to honor their children and the minor gods. 
 - Annabeth saying she didn't love Luke as he was dying. Not only is this statement BLATANTLY FALSE given that her crush on Luke is emphasized constantly in the series but her saying it to him and staring at Percy while Luke was dying just felt mean. It's like Riordan didn't think his readers would understand that Annabeth can love Percy AND Luke and still choose Percy. 
 - Rushed redemption of Luke with shoddy explanation that it was attacking Annabeth that broke the Kronos spell. Too little too late, buddy. 
 - General uneveness of the end going from horrific deaths to party/happy atmosphere with very little reflection on the dead until two chapters later and even that was overshadowed by the Annabeth/Percy thing. I think it made the deaths, particularly Luke's, feel less important and quickly forgotten, despite Percy asking for his wishes. The rewards chapter was just too damn happy. It was like Riordan was afraid of letting the deaths sink in. It reminded me of The Guy With Glasses' comments about when Bambi's mother dies and the next scene is singing birdies. Bleh. 
 + Overall, a great book and a great series, with minor issues in the uneveness of the storytelling and Luke.