Readability: 4 This was a pretty easy read. A lot of it is "stream of consciousness" so there are a lot of fragments. But if you can get past that it's really easy to read.
Teachability: 5 This one is more for enjoyment than teaching. As with most books it is good for teaching setting and voice (particularly stream of consciousness) but not much else about the book is "teachable." (Suggested grade level: no lower than 9th grade. There are some pretty sensual scenes in the book. I don't suggest recommending it to younger readers.)
Did I like it?: I sure did! This is my second reading of the book and I liked it just as much this time. I like the perspective and the fact that it is both a physical and emotional journey for the main character.
Summary: Katsa has a talent for killing. King Randa, her uncle, takes full advantage of that and uses her to exact retribution on those who offend him... Until Katsa decides that she doesn't want to be his dog anymore. She sets out on an adventure to right the wrongs caused by a king that the world doesn't suspect, with her new friend Po.
Recommended for: Anyone. Though the protagonist is female the book could still be appealing to boys. Though there is a lot of emotional stuff it is a very adventurous, action packed story.