My attempt at a book review

I was reading the Maze Runner and I would like to critique this series. The first book is engaging, the plot progresses at a steady rate and  makes the reader wonder enough about the questions posed, so they will get into the next book. But then there's the next book. A love triangle appears out of almost nowhere and everything gets complicated. More questions are posed and people constantly switch from good to bad. You don't know whats reliable and whats not. Everything gets confusing. Too confusing.
My analysis: Book 1- Intriguing
Other books- Confusing.