Yesterday, one of my clients had drawn my attention to the fact that user cannot make reviews in his application.
After taking a look at the issue, it is found that the “Review” tab in the application profile is visible for my account (who is the developer / administrative of the application). The “Review” tab is disappeared for normal users.
Bug have been reported by someone already. You can see this at http://bugs.developers.facebook.net/show_bug.cgi?id=15090 .