Review

Allows people to provide their own reviews of this Thing. -- Collection: Required Type: Review Type
User Value Property -- has a different value for each User
If you put this Property on a Thing or Model, you can simply say [[Review._edit]] in your Default View, and it will allow you to provide a Rating and a comment about this Thing.
Review is a User Value Property -- each Member can give their own answer.
By adding this Property, you will also wind up adding the Rating Summary Property on each Thing. You can say [[Rating Summary]] to display a small bar chart of how many people have given each rating, or [[Rating Summary -> _average]] to show the overall average of the ratings.
If you just want a simple 1-5 star rating, use the Rating Property instead. (Do not use Rating and Review on the same Thing -- it will cause confusion.)
If you want to do more sophisticated things (for instance, having multiple different Ratings or Reviews for different purposes on the same Thing), you can define your own Properties of Rating Type and Rating Summarizer. However, this is fairly complicated, and is only for advanced users for the time being. For most purposes, the built in Rating and Review Properties should do fine.
If this Property was recently modified, the Summaries may be out of sync. Press this button to make sure that they are correctly calculated.

Things that use Review