If you were a Viking lad centuries ago, and wanted to learn how to train a pet dragon, this would be the book for you. In the present time, though, it's a good book for readers who like a funny, somewhat violent story, kind of like the BFG by Roald Dahl in that way. Not as sweet, though. It's a good book, though not amazing. The descriptions of characters are interesting, there are a lot of funny bits, and the writing is good. This book definitely builds toward the end, and gets more interesting as you keep reading. It's kind of like a goofy mini version of Eragon, but you'd have to read it to see what I mean. If you like dragons or Vikings, give it a shot. If you prefer nice school stories like those by Andrew Clements, read one of those instead.
This book is an example of an author pretending that a character in the book actually wrote the book. I don't really like that, but it does work for some authors, like Lemony Snicket. For this book it was fine, but it does make the book hard to find in the library, as you're not sure whether it's filed under the real or the fake author.