People seem to have this mistaken notion that AI is about the computer trying to win. It's never the case because the computer can pretty much win every single time in almost any game if it actually tried. It doesn't even have to cheat most of the time, but of course it can do that too. Randomness is not smart. If you're controlling Titan, and suppose you have to obey all the aggro/CD/targetting rules and you're playing against 8 really good players. After a while you'd notice Landslide isn't actually hitting any of those guys and you'd stop wasting your time on that. You'd likely settle on a rotation like Bomb -> Tumult -> WotL -> MB (to maximize the amount the healer have to move before you try to finish tank off with MB), and if this rotation works you'd just stick to it 100% of the time. There would be nothing random about it, and there's no reason for you to do anything different once you found a rotation that can defeat the players.