Space combat PvP and PvE. I look at my hangar full of ships and I see weapons platforms bristling with Rockets, Mass Drivers, Particle Cannons, Laser Cannons ans Rail guns. When am I going to get to use them?
Sparrow Racing. When are we going to race in PvP? Introduce two man sparrows so we can have a rocket race type mode
XurBall, you know what I mean. Grifball was one of the best things about Halo MP, so how about a similar mode where every one has the sword or Crota, no powers or grenades, and who over picks up the dead ghost to run it in to score is Xur
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In game clan management (aside from the more obvious things like story, etc)