I recommend stopping reading the series at book 10, and not bothering with the last 2 books.

At first I was thinking, "I don't understand why everyone hates Janet so much. They're great." Then I got to know Janet better and realized how manipulative and stupid they are. It was one of those rare characters that are so annoying that they drag down the entire book with them.

My full video review with detailed thoughts is at https://www.youtube.com/watch?v=c2XeH4F1G9A