A rought outline on how I rate the books I've read on bookcrossing.com.
10: Excellent. A book that has moved me or that just is a pure delight to read.
9: Great book. Close to being excellent.
8: Good, solid book that I would recommend to others.
7: Good book, but it didn't grab me in a big way.
6: Decent read, but not more than that.
5: Not my kind of book. Maybe somebody else will like it better than me.
4: Only OK. Would not recommend it to others.
2-3: Has major problems.
1: Simply not worth your time. Just leave it.
(inspired by cinnamon-girl)