After 4 SP missions i must say AI is not what i was expecting, also after GRAW1....
Friendlies are not so smart in cover finding and are slow to respond fire sometimes.
They should be ghosts, not "national guard just arrived recruits"...
Cover for friendly AI is often only run to a wall and stand side to it. Not lean behind it or something else.
About enemies i'm playing HARDCORE difficulty, and the only difference i see is that they shoot like terminators.
I really like to have enemies that don't forgive your faults, but the complete lack of any initiative different from cha