Another surprise is the somewhat disappointing performance by the game's artificial intelligence. Even on the tougher difficulty levels, most of the humanoid enemies don't seem to show the same kind of intelligent behavior that they did in the previous game. They'll seek cover and then peek out to fire, but invariably they'll charge at you, making it easy to take them down.
juste pour faire le malin : j'avais raison 
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(un posteur anonyme m'a renseigné là dessus tout à l'heure)