Tip: turn off the HUD, everything except ammo counter and health bar. This mimics the minimalist HUD from FC2 and it's incredible how instantly it makes the game 100% more immersive. Not being able to see enemies thru walls makes creeping around a base a nerve wracking experience, having to actually check the map to plan your route makes you have to be more aware of your surroundings, and not having an objective marker blink at you every thirty seconds allows you to take your time and explore the world so much more effectively. I highly recommend trying it for an hour, do one base infiltration with the stripped down HUD, see the difference it makes.