I think that to date AMS2 is the most beautiful Sim in terms of pure driving, on the contrary it is among the worst in terms of artificial intelligence, racing is an odyssey, your opponents don't know where you are, every time you overtake you are hooked, this problem was and still is. Pity. But I would also like to hear other opinions, yours!
I'm finding AI ok as long as you battle them fairly and leave some space. Maybe it's down to my driving style that AI is finding predictable, but generally I don't have any gnarly moments with them. Changing the aggression to Medium is recommended.