Ranked Playlists are needed nuff said
Destiny needs to grow more in the competitive side, in an environment where they are matched with equally skilled players, to provide everyone with a challenging yet fair match that can go both ways, making much room for self skill growth in a fun and fair environment.
Custom lobbies is also a good idea but has already been addressed as something the community wants
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Ranked Rumble would be cool too, and the winner getting good rewards, won a Rumble game and the dude that went dead last and a .12 gets 3 coins and a Legendary