Okay, so compared to the rest of the series, the reviewers are right.
I find it was because there was no dramatic climb to the end. Everything just came in waves upon waves; you almost felt like enough already. We get she is almighty and can overcome basically everything.
I didn't really like her snappish dialogue in this book. You could honestly say she was mean to people here. I really enjoyed the book Poison Study, and I can say I enjoyed Magic Study. This I had to push myself to get through. Not that it was boring, it was just SO much!