Great plugin, good work!
Working with ISBN works fine, gives the same ratings as shown on goodreads.com. Only sometimes, for instance a dutch book ISBN gives 4 stars based on 4 ratings, while the book has come out in 100 editions and goodreads total rating for all editions is 4 stars based on 43291 ratings. Is there a possibility to show the total rating of all editions? That would make a great extra statistic figure on the website. (not that dutch readers don't exist, but still..;).