I cant get into this review too much without spoiling it, its the fourth book out of seven.
Overall, in Goblet of Fire I really feel like things were heating up, it was becoming darker. Pieces of the whole puzzle were being put together. I love how this one had the Triwizard Tournament, I liked how it strayed from the usual course of events. I loved how we got to see a more feminine side of Hermione, I enjoyed her scenes with Krum, and the boys trying to ask girls to the dance. I love how Hermione tried to free the house elfs and try to basically unionize them. She's definitely my favorite character.
So far, this is my favorite book out of the series. I cant wait to see where it goes.