Do amateurs have a different approach to critique than professionals? On the basis of analysis of 2,300 professional and 40,000 amateur reviews posted on a French web based platform providing information on cinema, the authors identify three main differences: in the choice of films criticized, in the ratings given, and in a reviewing model centered on reception and emotions used by part of the amateurs. They also show that the profiles of contributors (number of reviews posted, length of time of subscription to the site) is related to the type of reviews posted (choice of films, models of argumentation): the more often an author post reviews, the closer the critique will be to the norms and formats of a professional critique.