Finding the best criteria for your evaluation: In order to do this kind of writing well, you need to determine what sort of a topic you are evaluating. If it is a movie, then what genre is it: horror, romance, drama, etc.? Then you need to decide what would make an excellent movie in that genre in your opinion. For example, you may decide that a good romantic comedy has to have three things: humor, surprising plot twists, and actors you enjoy getting to know. Next, you will evaluate the movie you have chosen to see how well it matches those criteria, giving specific examples of how it does or does not fulfill your expectations of an excellent romantic comedy.
A similar type of review that may be biased is the so-called " puff piece ", a review of "[a product]", film, or event that is written by a sympathetic reviewer or by an individual who has a connection to the product or event in question, either in terms of an employment relationship or other links. For example, a major media conglomerate that owns both print media and record companies may instruct one of its employees in one of its newspapers to do a review of an album which is being released by the conglomerate's record company. Although some journalists may assert their professional independence and integrity, and insist on producing an unbiased review, in other cases, writers may succumb to the pressure and pen a biased "puff piece" which praises the product or event while omitting any discussion of any shortcomings. In some cases, "puff pieces" purport to provide a review of the product or event, but instead merely provide " peacock words " ("An amazing recording"); " weasel words " and tabloid-style filler which is peripheral or irrelevant to assessing the qualities of the product or event ("During the filming, there were rumors that romantic sparks flew between the two co-leads, who were often seen talking together on the set").