The AI on lower or moderate skill levels is much more realistic and can´t see through bushes (!!!) but through grass (what you can´t in 1st person mode).
Additionally, there are AI mods like ZeusAI, which make the AI using opincer and flanking maneuvers, usage of smokes to cover themselves, covering fire etc.
The more complex the AI is performing, the more CPU power it eats. With a dual core you can have serious problems in contrast to a Quad core which can spare one single CPU just for AI calculations. The more complex you wanna have your AI the more CPU calculation it needs. The ArmA 2 AI is an open world AI and stands in no contrast to limited environments like Battlefield, Call of Duty Crysis etc.
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