I know you guys probably get a lot of these requests, but this is probably the only thing I have against destiny. I've come across far too many instances where one if my friends or I get a legendary or rare item that either I already have, or is not as effective as the one I currently have equipt. I hate dismantling perfectly good gear while my friends needs it pretty bad. There needs to be some sort of trading system or some system where you can give and receive items.
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Warframe has an interesting trade vehicle. You need to be in a clan or in contact with a clan to trade. You also need an appropriate amount of currency on hand to 'swap' for the trade item. This currency goes in to the clans coffers, not players pockets.