I think people believe its a piece of cake for creating a series based on book. But in my opinion it is not that easy.The same plot as the book every time makes it predictable so obviously even if the book is great there has to be some changes to make it interesting for there viewers.we can write almost anything without much effort but to make it look exactly like that is difficult.so to the people who read the book and comparing it to the series if you don't like what you are seeing don't watch it because you surely enjoyed the book so why bother. But for people who have not read the book Like me this series is actually a treat.All seasons are good maybe 1 and 2 seasons are more enjoyed because it is more similar to the book I guess.But as a person who didn't read the book I actually enjoyed all seasons very well. So if you are going to watch don't consider the reviews of readers. Because reading and viewing are 2 different things altogether.