Here are a few examples of essays that review controversial documentary films. All of the essays are fairly short, providing a good model for the length of the essay you are writing. They are all also valuable because they do not only review the film’s aesthetic qualities, but consider them as communication tools that are making arguments and have a social significance and impact.
The first two are about Kony 2012. The rest are about the global warming film, An Inconvenient Truth.
Mark Drumbal “Child Soldiers and Clicktivism: Justice, Myths, and Prevention” J Human Rights Practice (2012) 4 (3): 481-485.
David Hickman “Jason and the Internauts” J Human Rights Practice (2012) 4 (3): 475-480.
Jenna Coriddi “An Inconvenient Truth.” Policy and Practice. (2008) 6
Eric J. Steig “Another Look at An Inconvenient Truth” GeoJournal (2007) 70 (1): 5-9
Roy W. Spencer “An Inconvenient Truth: Blurring the lines between science and science fiction” GeoJournal (2007) 70 (1): 11-14