Game needs some difficulty tweaks, perhaps a 4th harder difficulty mode
Game needs a 4th difficulty, perhaps make harder enemy types spawn more often, make reinforcements get called more often by roaming patrols, shorten the detection meter time, increase accuracy of enemy aircraft gun strafes, increase enemy aircraft bomb damage and radius, make enemy snipers more powerful etc...
But the biggest problem, that I think needs tweaking on normal and hard mode as well, is outposts and patrols need more defenses against players in armed aircraft, especially in coop.
I have never been killed by an enemy in an armed helicopter or plane. AI need to use turrets more effectively against aircraft, and RPG gunners need to more frequently have lock on capability.There are anti-lock-on flares on many aircraft, but 40+ hours in I have literally NEVER been locked onto
Game is great, but once I get good gear and perks, even on hard mode I have to deliberately limit myself to get a fun challenge.