T4R
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1) A Cohesive Story rather than some disjointed story lines. 2) An escalating Horde mode with Real Loot (i.e FireFight as in Halo ODST / Halo Reach) in an open area - rather than an Arena. 3) Space ship battles - just like in Halo Reach. We have all these "expensive" ships - why can't we use them for something other than filler when flying between planets.