According to Ruth Reichl good reviews (whether food, travel, books or art) prepare the reader for the experience and the most important rule is to review what they are trying to do, not what you wish they were doing.

Reviews can be short and to the point with a word count of approximately 100 words, or they can be long and detailed with a word count from 500 words up. When you are reviewing for papers or magazines you will usually be given the details on the word count.