1 Star: Horrible, horrible, horrible. Not worth the time or the effort. Be a miracle if I read it again.
1 ½ Stars: Just slightly better than 1 star. Possibly becuase of the idea, the writing, or the style. Won’t read it again.
2 Stars: Bad. May not be worth the effort, but something about it was okay, and commendable. Most likely won’t read it again.
2 ½ Stars: Slightly better than bad. Not quite a 2, but not quite a 3 either. Probably won’t read it again.
3 Stars: Average. The book is okay, but nothing really stands out about it. Possibly will read again.
3 ½ Stars: A little above average. Like earning a C+. It’s okay, but has enough extra to make it look better. Might read it again.
4 Stars: Liked it. Was really good, and will probably read it again.
4 ½ Stars: Really liked it. Was excellent, and will most likely read it again.
5 Stars: A rarity. Loved it, and was very, very good. Will recommend to a lot of people. Would be silly if I did not read again.
Keep in mind that this is more like guidelines, not specifically a set rule.