Generally, when I assign a review article, it is generally an opinion piece on the movie, CD, or piece of literature.
It includes not only a summary of the plot, but also a description of the setting, symbolism, tone, style, characterization, and use of metaphors and similies in the piece.
Finally, it is a personal reflection on how well each of the things above are done and how each item contributes to the overall quality of the work.
In a review article you have to say everything that can be said about something. If you are writing a literary review, you should read the piece and then provide your opinion on the topic. Start with a summary of the work in question without including every single detail. Depending on the topic and the one who asked for it, you will probably have specific guidelines that you are expected to adhere to. Then you should write about the significance of the subject matter, compare it with other similar pieces to emphasize its characteristics. In your final paragraphs you should present your personal evaluation of the piece. It may be a good idea to re-read your review some time afterwards to look for possible errors.