Your movie or TV review should be between 200 and 400 words. The purpose of a review is for you to tell others what, in your opinion, to expect. This means that you should tell us what the movie or TV show is about, but it also means that we want you to go beyond a simple plot summary.
If the movie is part of a series, how does it compare to the others in the series? If you familiar with one of the actors you might say something about how this performance compares to other performances you are familiar with.
Explain your opinion with references to the work. Don't just say, "I like this movie," or "I didn't like the TV show." If you have seen the work you are reviewing many times, you may want to say so.