1 or less: RUN!!
1: don't read it
2: read it, I guess
3: it's OK, I wouldn't run out and buy it
4: one of the best, but not the creme de la creme
5: Ye gods! You must read this book! Run out and buy it!
If I say that it should be more than five you absolutely MUST MUST read this! If you don't read it, you are an evil person (just kidding!). :)