I'm unlikely to rate very low. I read a lot, but I'm unlikely to finish a book I don't like, nor will I rate a book I don't finish.
I tend to rate books based on how they fit in their genre or sub genre rather than an absolute score.
1 Star-Just awful. The only reason I managed to complete it was either because it was short, I because I needed to justify to myself actually rating it and writing a review.
2 Stars-This book was ok. I managed to finish it without a fuss but it doesn't entice me to read other books by this author or in this series.
3 Stars-This book is fairly decent. I am likely to read the rest of the series or other books by this author. However, I'm only likely to re-read this book if a new book is coming out for the series.
4 Stars-Really enjoyed the book and will definitely be reading more from this author or more in the series. I'll definitely re-read when new books from the series comes out and may re-read if I don't have anything more interesting to read at the time.
5 Stars-I absolutely adore this book and am likely to re-read it on the slightest pretext. I'm also likely to devour any and everything in this series and by this author.