This can be a good thing if done right, Madden football has been playing with it for years. Example if you have a tendency to come back to the same plays over and over again, the computer starts playing defenses that will stop that play, it's just like AI for some games. It makes for a better feel for the game as opposed to your hopelessly behind enemy popping up with superweapons. You can make a game adapt for better play without resorting to "cheating"