Best AI in games

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I feel like AI is something that has not really improved much in the last decade or so, as evidenced by a lot of us giving the title to games from last gen or even earlier.
Heck, I'd go so far as to say a lot of games this gen fall short of the standards of the original Halo circa 2001 in this field. Moving forward, I'd like to see more effort poured into making game characters, both friendly and hostile, behave in more lifelike and dynamic ways.