Reviews I have seen also use language similar to that used in the film, for example a review of Sherlock Holmes uses a wider vocabulary, as the characters do in the film. This makes my film review a little easier to write, as there is no speech I don't have to fit to a style of speech.
In my research, I found the following, an article titled 'How to write a short film review'. I won't follow this plan, however it is useful to have a very basic structure to follow, as I found most film reviews are diferent based on the genre of film, style of magazine and who wrote the review (and their preferences).
From: http://www.ehow.com/how_5211353_write-short-film-review.html