A	An excellent book. There were few, if any, problems with this that I could see, and any that were there were ignorable in light of the overall quality of the story. I would heartily recommend this book, and I may try to get it in hardcover, if available.
B	A pretty good book. Problems were noticeable, but easily overlooked or dismissed. Alternately, it's a good book that just didn't go the extra mile to stand out. I liked this one and look forward to reading it again, and will recommend it to people.
C	A borderline book. The problems in this book were pretty jarring, and may affect the plot. I found them either too numerous, too noticable, or just too annoying to to pass them by. I might recommend this book, but probably only to people I already know are interested in the subject matter.
D	A poor book. There were some major problems in this title that were impossible to ignore or made me just plain dislike it. I had to force myself to wade through it. I would hesitate to point this title out to anyone, and may end up selling it to a used book store.
F	A failed book. This title was so riddled with problems, or perhaps the content was so reprehensible, that I simply could not finish it. Or the book just might not have been my cup of tea. I would have a hard time recommending this to anyone, though in certain circumstances I might not warn people away. Read at your own risk!