The book has a great concept, making magic a bit like vampirism. The magic-users know that, by doing magic, they are causing someone's death, bit by bit. There's a conspiracy of silence about it. The book is mostly from the pov of the magic-users.
That was the problem for me. I couldn't bear to read their pov for very long, I couldn't bring myself to become involved in their story because I was so opposed to it, even though I knew by the end it was likely change would occur.
I didn't want to read it, so I stopped. Sometimes it's just easier that way.