I really enjoyed this series. It reminded me of the Harry Potter series, but with a twist of it's own. I enjoyed the adventures that Percy and his friends took. I wasn't going to read them at first, but since Nat has read them, and we have the movie from book 1, I decided... why not? I also decided to read them, because of the kids. We initially bought the books for them to read.
I read these 5 books in between reading my other books for book club. I think my favorite of the whole series would have to be the fifth and final book. I think that the author had really ended the story well.
I am now off to read The Lost Hero (Heros of Olympus), which is also by Rick Riodan.