I haven't finished the series yet. I'm halfway through The Battle of the Labyrinth (book 4), and I realized what's missing. One of the biggest problems I have with this series is that Percy's perspective doesn't change. He's getting older in the series and the transition from pre-teen to teen is huge. But I feel like his thoughts and his way of thinking about things is stagnant. Yes, he relies on his old experiences and instincts when confronting new problems. He doesn't really have teenage boy problems though. I feel like even though this is a series targeted for a younger audience, there should still be some mention of Percy trying to achieve maturity. The action and adventure overwhelms any mention of Percy growing as a character and a personality.
There are hints when it comes to his relationship with Annabeth, but it's kind of pushed aside and never confronted. Maybe everything that I'm complaining about goes down in the last book... but I don't think this series had to wait so long for it to happen if that's the case. C'mon now. Percy is jealous of Luke and Annabeth's obsession with Luke, so would it really hurt to spend two pages talking about Percy's feels? I want to read about his feels that reflect my feels about his feels.
And can we talk about how fucking cute Clarisse is? Omh she's like the third grade bully that pulls your hair, but turns out to be a marshmallow.
(can we also talk about how hot I am for Apollo and Luke?)
Of course someone is going to disagree with me on this, but I just wanted to share my thoughts.