Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Unexplored potential

As a fan of the Nick series Avatar: The Last Airbender, I was utterly disappointed by the melancholy attitude of the entire film. The special effects were worth the two stars, but there was absolutely no humor in the movie. I felt that the depth of each character was paper thin. They missed several key plot points for Book 1: Water as well. I understand that you can fit only so much subject material from a season into a feature length movie, but I felt they didn't even try. If they decide to follow up with books 2 and 3, I sincerely hope that it is written differently. They have great source material, so this shouldn't even be an issue.