Instruct: Classify a given Amazon review into positive or negative sentiment.
Query: Disappointingly thin!

These "books" would more aptly be called "pamphlets." There was much ado about Rowling writing these for charity, but, really, how hard was that? She probably wrote these in a couple of afternoons. Now, if Rowling donated the proceeds from the next three novels in the "Harry Potter" series, that would be something else. Rowling is a multimillionaire several times over; she can afford to donate all the income for the rest of her life to worthy causes. These tiny, cheap "pamphlets" just don't cut it. Rowling's creativity and humor is one thing, but please don't admire her for throwing these breadcrumbs at the poor.