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I look at the trailer, i notice that the AI in Half Life 2 not as good as Halo 1 or 2.
Halo 1 the AI, really know how to avoid no matter what and they can differentiate a lot of things...
But in Half Life 2 trailer, they see the bad guys, they hide behind something and shoot, but when the enemy is near you, they won't run away no matter what!