Was arguing with a guy at work about how great Halo was, and realized something. If there was one singular thing that separated C.E. from its contemporaries (and a lot of games since), it was enemy psychology. No other game did so much to make you believe the enemies were real. Varying states of alarm/quiet...many games still don't seem to have that. Or even non-combat animations half the time.
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I must know what other games have it!! Do tell us Invasion, of the games that are from 2003 and up. I still have enough Microsoft points to buy a game...