1/5 Stars - Had to stop reading, or lost interest. Or, I really wasn't a fan.
2/5 Stars - Didn't like it, but made it to the end of the book.
3/5 Stars - It was an alright read, but may have left some room for improvement. Also if it had a very unsatisfactory ending but a good over-all story.
3.5/5 Stars - Pretty good, but not one of the best books I've read.
4/5 Stars - Really good book, that I would recommend buying or borrowing from a friend / the library.
4.5/5 Stars - Almost perfect, this is one to have on your shelf.
5/5 Stars - Favourite Material Right Here! I own it, give it away as gifts, and shout it's praises from the rooftops.