There are clearly trade-offs that come with school size. On one hand, a certain critical mass of students is necessary to justify the faculty, resources, and facilities that make the school competitive. On the other hand, a large class implies an impersonal bureaucracy of student processing where everyone is a stranger.
You must judge what is right for you. Small classes imply more personal attention given to individual students, and large class sizes may mean a well-known, popular, quality school. Keep in mind that a large entering class may be divided into class sections, each of which may be small enough to avoid being impersonal. Therefore you should pay attention not only to the size of the entering class reported by a school, but also to the maximum number of students that meet in classrooms, both for core courses and elective courses. Large lecture hall class meetings may not be as comfortable or desirable as small seminar classes.
You may express a preference either for large or for small class size by assigning a weight to either criterion. The guide ranks schools highest according to your preference.
This is a help page for a Search & Rank option on the Official MBA Guide.