Wavering between a 3 and 4.
I'm always leery with everything far because their effects on humans always teeter close to what I call mind-rape for me - whether you use force or invade a mind, same difference. The only reason I didn't walk away from the book is that Mackenzie knows its there - and she's had ten years to know how it works and to fight against it.
It's also a triangle trilogy...and the author isn't making it convenient for me to hate one over the other because one's good and the other's an asshole. They both have their moments - good and bad.
I still have my favorite tho.
It's an interesting spin on the fae world, though, and I'm interested to see how the events of Shadow Reader will play out in the next book.