Hey Team,
I play on extreme difficulty and prefer the immersive mode. Enemy difficulty feels great in firefights to me. Two issues I noticed early which are a bit immersion breaking is that the AI is insanely strong if you circle the zone on a chopper. I can complete an entire zone by never firing a shot this way as the AI is insanely accurate and kills quickly. Second, If your chopper is shot down the AI do not die. They will get out the chopper and resurrect you, only for you to die in the fire with no way out. Hope this helps.