There's a talk somewhere about the F.E.A.R. 1 AI and there were two key changes made in the development: 1) it was restricted so that only a handful of actors can actually attack the player at the same time 2) introducing loud radio chatter because playtesters grew frustrated dying over and over to the AI just flanking them quietly. Before these changes playtesters were frustrated because they thought the AI is cheating (which it isn't).
