what is the purpose of a magazine film review?

The main purpose of a film review is to give an outside opinion to a film, this could either be a good or bad review and the makers of the film have no influence over the outcome. One benefit for films of film reviews is that if the review is a good one, this could greatly boosts sales, however if the film critic says its a bad film, then this could destroy sales for the film. If the film review is good, this could be seen as free advertising as they do not pay for the critics to review the film, but it still brings in more sales. There have been examples of films that have not let critics watch the previews of a film because the producers themselves knew that the film was not a good film, and if they let film critics review the film before the film came out, they would have lost a lot of money.

The difference of film reviews and film posters is that, film posters are made by the producers of the film, and so they would make the film poster look as good as it could be so that people would like it. The audience would rather watch a film based on the film review instead of the film poster as the film review is more honest, and even if a film poster looks good, it doesn't mean that the film itself would be a good film.