User blog comment:BobbyHOA78/Any Percy Jackson Fans Out There?/@comment-4238166-20140121213558/@comment-4238166-20140124030733

HoO has character development- for the old characters. Jason is boring, Hazel is slightly less boring and Piper is just...ugh. Don't get me started on her. Their relationship, too. It's based on fake memories and Piper's extremely possessive. I think RR is rushing a bit with these books and cares more about pleasing the 11 year olds who enjoy love triangles now. Love what he did with Nico, though.

It's also become more predictable. In PJO each book was different and exciting. With HoO it seems he's not really making any huge plot progress.