Warframe has a lot good ideas running around it. Clans also have a real purpose in the game with Dojos and research modules that allow for specific weapons and frames to be built soley by clans. Controlling and taxing maps with Dark Sectors that generate clan combat for sectors. Tradeposts and just general access to the Void and Derilect with other players willing to farm for Prime schematics and rare mods. We'll see what Bungie brings to the final game at launch.