Well, to be clear (from the style guide):
The Description field should be notes about the games packaging variants/ pack ins/ collector's edition details. Or trivia about the games release, such as if it is a launch title, last title, a very limited release, etc. This should not be filled with store descriptions describing the gameplay or hyping up the title.
But I like the idea of cleaning up that field. Too often it has a synopsis of the game, etc., and that's not what it's there for. Usually I end up removing that field all together if there's nothing to particularly note about the game and the contents of its physical copy.
Someone has been working on an NES game contents FAQ. Basically people are opening sealed games and creating a list of every item that came in the box. Manuals, registration cards, dust sleeves and so on. Is that the kind of thing that would belong in the description field?
The list is here:
http://www.gamefaqs.com/nes/916386-nes/faqs/49943