5 gnomes = a truly great book that I will buy and treasure.
4 gnomes = pretty darn gnometastic, something I would definitely reread.
3 gnomes = average, not something shiny that you would want to take home forever but worth a read if you're interested.
2 gnomes = this book will not melt your stony gnome heart
1 gnome = bury this book somewhere deep or give it to someone that you dislike.
a gnome hat = what I add on to the rating if I like it but not enough so to get to the next number rating.
Example: 3 gnomes and a gnome hat out of 5.