Review is a writing assignment that should give a critical, well-argumentative evaluation of the fact or the event. Depending on the requirements set by your tutor, it may formal or informal. The main aim is not the style but the aim of the review - critical evaluation of the work. Your argument as well as your opinion plays one of the most important roles in the writing of this type of an essay. Nevertheless, in judging the subject, you should be impartial. All your contentions should be backed up with the evidence.
As you apparently know tutors set different standards for writing of different essays. Nevertheless, generally this type of an
essay is evaluated on the following criteria:
Do you present strong arguments?
Do you give your conclusions?
What is your reaction and your argument?
Remember that a perfect review comprises the critical analysis of the work quality as well as reveals some information about the merits of the work.