** spoiler alert ** 
 I read this book in a day. A day. I'm so proud of myself. 
 Okay. So. As a person who always believes what the protagonist believes, I could not BELIEVE (can I stop saying believe) when Sirius Black was actually a good guy. I love him as a character now, but I really thought that he was a bad guy. The whole Marauder's Map thing was absolutely FANTASTIC. (I solemnly swear I am up to no good. I KNOW WHERE THE QUOTE IS FROM NOW!!) Every single element in this book is so well thought out and developed and I love it so much. It did not drag one tiny bit. I absolutely l o v e the Quidditch scene and I feel every single one of the emotions during it (and the rest of the book as well). I'm not a person who normally expresses emotion out loud while reading a book, but I was whispering "YESSSSS" and pumping my fist in the air while reading the scene. (I almost cried when I believed Hagrid's bird (WHY CAN'T I REMEMBER ANYTHING) died.) 
 Again, this book is fantastic and everything about it is fantastic.