It's a 3,5 /5 for me, and most of it is based on the second part of the book. 
 The first part is not so great , first because I simply wasn't drawn into the story. I liked the idea of having a main character that was a psychopath, pure and simple, but for the first 200 pages... That was it. He is very very bad and heartless : we get it. Where is all of this going ? Also, making Jorg only 13 at the beginning didn't help, I just couldn't believe a group of outlaws would follow a boy from 10 to 14. Doesn't matter how mean and bloodthirsty and creepy he is. Him being the leader just didn't make sense to me. 
 Anyway, pieces finally started to fall into place and once the real story started I was hooked. I'll probably read the next one, as I want to know what happens next (even though I've seen the titles of book 2 and 3 so I kind of know where this is going) but I don't know when that will happen. 
 Also, I kind of like Jorg... Mostly thanks to the second part of the book that gives a lot more to reflect on than just "that guy killed his mother and brother in front of him so he turned sociopath and decided to kill anyone who crosses path with him". 
 So to conclude, if you start it : don't stop before page ~200 because that's when it gets interesting and good.