Bungie are you considering changing the faction currency for DO, FWC, NM? It makes no sense and to be honest it is a poor show to rank up in a faction and not be able to buy items from them because you don't have the right marks. eg, you get all your marks from PvE and hate PvP but want to buy some of their stuff.
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Even if you lose at crucible you get 2 marks, this is a win win situation you can try the crucible practice and get better. Trust me crucible is just the same as any FPS game. Get with the flow learn the maps and guns you'll be 1.6 KD easy In a couple days you'll be fine.