I like it.
So, if I've offended any of my author friends with a three star rating, please rest assured I mean it as a positive review. Three stars is kind of my default rating. I don't bother rating (or even finishing) books I don't like. Four stars go to books that have something special about them that I especially like. Five stars are reserved for books destined to be my all-time favorites. Ender's Game, Lord of the Rings ... you understand.
It's so hard to boil down how you feel about a book into a number between 1 and 5. That's why I don't particularly like Goodreads, actually.
What do you think? What kind of books do you give three or four or five stars to? Would you be offended with a three star rating?