Prevent Rate/ Review products for coming soon
If an item is marked as coming soon, for example any item, but it could be a DVD movie for example. It will go in the coming soon section, so it can easily be coded that if it is coming soon, it should not be possible to rate or review it, since how can the customer have seen the product?
IMDB only lets users rate or review a movie after its release date, you can't rate a movie that comes out in 4 months time. Could be a simple but noticeable improvement.