What do you mean by a review? If you mean a review is to assess, analyze or appraise. So you are right that is what you are supposed to do in a review essay. The purpose of a review is to evaluate or express one’s feelings about something or assigned topic. It is basically a person’s evaluation of what he/she is reviewing or analyzing.
The judgment of the writer must show confirmation to his/her opinions about the work i.e. the writer must be evident and confirmed while writing a review essay. A review can be formal or informal depending upon the assignment of the instructor. The formality of the review is decided by whether it is an analysis, summary, or just a person’s reaction around a theme, topic or idea. Usually the reviews that are written and are related to what an instructor wants to know how you feel about a movie, a concert, a book, a piece of art, or a particular work. Thus reviews are written about the feelings of the writer centered on a movie, a concert, a book, a piece of art, or a particular work. Two steps are needed in review writing. First, the reviewer must develop an argument and lines of reasoning about what he/she is reviewing. Second, the write up of the review must be structured and organized. Thus a good and well written review should clearly state the opinion of the reviewer about the work and why the reviewer feels the way he/she does while conducting the analysis.