I wasn't aware AI factored into "art". Always seemed like a different field of study to me. Less pixel-paintin' and poly-stackin' and more number-crunchin'.
Besides, the AI in the CoD games does well enough for what it's supposed to do, which is swarm you in respawning waves and shoot at you. They really don't need to be sophisticated tacticians. For what it's worth they take cover, use grenades, switch positions occasionally and in certain cases they even do funny things like crawl around and shoot at you from the floor after they've been injured. What more can you ask for, really?
And to put it in movie terms: The games are very well produced and the art direction does an outstanding job working with the resources they got. What absolutely stinks, unfortunately, is the screenplay and the direction.
So if you, like any sane person, agree that a lot of good work went into the art of the game and you, like an elitist prick worth his salt agree that the game's direction is horrible then don't pirate it! For one of two reasons: Either buy it because it's a well-made game and you apparently don't mind the direction, or stay away from it because it's a stupidly directed game. But don't pop in here saying you torrent this because you don't like it. What kind of hypocritical nonsense is that?
There ARE games that are truly bad and you can't be expected to pay money for them. So if you want to boast about torrenting them as a goof, fine, but the CoD series is far, far above such games.