When I was playing Halo 2 and the campaign level Sacred Icon i find it interesting that the AI is harder to handle then the AI’s we got in Halo 3 and reach, In halo 4 there are also harder to handle but but not the same as in Halo 2, in Halo 2 they will put up a fight, also the flood where able to Hijack friendly/enemy vehicles which what made the game harder to play then its younger brothers. Now I’ll like to know if you want this AI back merged with the AI from Halo 4 since in halo 4 they know how to cover or know the that the current situation is to big for them to fight alone.
I think the Ai in H4 is OK. in that its a challenge but not too hard (i will admit in H2 they would proper hunt you down).
The Prometheans thought are think as -Yoink- - all they do is plod around and teleport with the the occasional potshot. The only thing that makes them hard is their sheilds they are just giuant bullet sponges.