This series was good, but I felt as the series progressed it sort of lost itself.
I'll explain what I mean by this, by briefly giving a review of each book.
The Red Pyramid:
The first, and strongest, book in this series, it delightfully introduces us to a new world with a cast of diverse and interesting character, really, what could go wrong? It had an awesome conclusion and finale.
The Throne of Fire:
I'm not even sure what went wrong here. The first half was fine, I suppose, with even some good scene (like Sadie's chase scene in London), but towards the end it just got worse and worse. The conclusion just wasn't gripping, and I felt bored. I feel like the series lost itself in trying to stick to the same formula.
The Serpent's Shadow:
It was better than the Throne of Fire, but not as strong as the Red Pyramid. It was fine I suppose, but the plot itself was hardly memorable, despite a suitably exciting final battle scene.
I was disappointed with how this series tapered off, especially after such a promising start, but I feel part of the problem was the author himself. Whereas at the beginning he was excited by a new world, moving on from Percy Jackson, the Heroes of Olympus series then started. It honestly felt like Rick was trying to get this series out of the way- it wasn't commanding his full attention.
I mean its no secret Rick is a bigger fan of Percy Jackson's world, maybe because that's where all his fans are. I mean, in Magnus Chase, how many references to PJO and HoO? And how many to the Kane Chronicles?
So yeah, a decent start but an unimpressive, even if not bad, ending. Lets hope Magnus Chase, seemingly another trilogy, doesn't suffer the same fate as Trial of Apollo now start as a new five book series...