5 keys - Abso-bloody-lutely incredible. Definitely one of my favorite books. This book is as amazing as it gets! I need you to go buy it right away.
4.5 keys - This book was incredibly good! There were minor flaws, but the awesomeness of the book will sort of cancel that out.
4 keys - Great! I liked this book quite a lot and would recommend it.
3.5 keys - It was pretty good. There were parts that I didn't like, but there were parts I did like as well.
3 keys - This book was alright. It wasn't very good, but it wasn't awful.
2.5 keys - This book wasn't really for me.
2 keys - Bad. I don't recommend it.
1.5 keys - Was an absolute chore to get through! Pretty terrible.
1 key - The lowest rating. Either DNF or just plain horrific.