My spelling is really out of whack today lol

What do you think makes Good Artificial intelligence in a game .

I will pick out Killzone for reasons some won' t understand.

Well in KZ on multiplayer when your are fighting the com your
likely to be able walk up behind an opponent and kill them.
Some people think it is bad AI.
It is actually more realistic AI, as the com can' t see you for without reason.
I like this some think it is stupid AI but it is really artificially flavor intelligence.
Since it is not an actual human it has to tas.. put in something that is made
to perform similar without side effects of the com just
knowing exactly where you are

DON' T GET ME WRONG (darn capslock) I still like the Omni All Knowing A I too
(for direct difficulty and predictability)but I would still rather have both.

What are some of your examples and hopes?