Because Anne Frank didn't publish this herself, and therefore didn't edit it for the public, it's incredibly difficult to rate and review her diary. Many folks complain that it drags on - they're not wrong. Some sections are lengthy (such as some of the ones about quarrels and who said what), and, in a novel, would have been edited down, but this isn't a novel. This is the diary of a young teen, meant for her eyes only. We only get to read it at all because the Gestapo left it behind and Otto Frank subsequently shared it in her memory. 
 Summarizing, however, doesn't present the same moral issue that reviewing this in the proper sense does. Anne Frank's diary is touching and poignant. It reveals time and time again that she was wise beyond her years. No doubt she would have had a successful career in writing had she survived. Her diary speaks in a personal way, the way one would except a powerful novel to relate to its readers. Undeniably, this is a book that everyone should read once.