User blog comment:SayuriDarling/Magnus Chase and the Gods of Asgard Official Discussion/@comment-25044056-20141023194529

I am already very concerned about the quality of this book. I did not like the Blood of Olympus, I think it is the worst book in the Percy Jackson meta-series. The pacing was bad, the whole middle of the book is mostly just padding and the final battle was over way to quickly.

I attribute these failures to the fact that Rick Riordan was writing three stories in the span of a year. The staff of serapis, Percy Jackson's Greek gods, and the Blood of Olympus.

Now Rick Riordan is also writing three stories at once, "the crown of Ptolemy", Percy Jackson's Greek Heroes, and The Sword of Summer.