[antris]

One of the design goals of game AIs is also that they are fun to play against. If they are too smart and coordinated, they try to throw you off in a way that feels "unfair" to the player.

You have to hit a spot where they are sometimes a bit surprising, but not in a way that cannot be reacted to quickly on your feet. This throws realism out of the window.

[wtetzner]

But why would good game AI have to make the characters better than the player? The focus on NPC AI should be to make them interesting, not necessarily really tough opponents.