Its late response but I am playing FC2 again. The stealth is quite good and challenging. Although AI is too good at tracking where even the silent dart came from. I am replaying this game again on Infamous difficulty so stealh is the ky to win here. I am using my other game experience like ARMA 2 for tactics, Old Splinter Cells, Hitman... for stealth. Now if you follow these rules you will get the hang of it and it will be pretty enjoyable.

LOADOUT:

Machete

IED/Silent Makarov

MP5

Dart rifle/ Crossbow

Camosuit

RULES:

!!!!!BE PATIENT!!!!! If not then stealth is not for you.

Always be ready. Be stocked with ammo, meds and new guns.

When travelling try to avoid contact at all costs. Thats what makes this game boring when you use your health, time and ammo fighting at checkpoints or patrols.

Travel at night, use bus stations, travel by water if convienent, drive off road to shortcut, to avoid checkpoints, settlements, patrols.

Have fun planning your mission execution and escape.

Act only during night. Start around 11 P.M. and untill 4 A.M.

Scout area and guards actions before acting. If possible use highpoints, use grass and bushes to hide and freeze for your camo to work when guards are nearby. When watching for guards around corners move slow and dont show your whole body.

Take your time, don't sprint around in open, even if they are quite far from you. When swimming under water, swim at the bottom. If needed sacrifice your health in there not in battlefield.

Kill only if you must and theres no way past the guard or he mustn't see the bodies.

Don't miss your shots, all shots are headshots, don't spray around, only single shots.

Make sure noone will find the body.

Guards hear nearby shots and deaths. Kill only when they are atleast 10m away from eachother and not looking. Dart rifle is most silent weapon.

Lure single guard away from his post by quickly partly showing yourself. He will not be sure about danger and blindly walk to look around. When he's far from others and his body won't be seen you can kill him in the head.

If sniper mortar bazooka scouts are unseen by other guards, kill them from far away to make sneaking around easer. Or monitor his scouting and move from cover only when hes lokking away.

IT IS NOT TRUE THAT MACHETE IS NOT STEALTHY. For example: One guy is sleeping and the other is outside really close. He will hear the shot. Slowly move to the sleeping guy tapping your walk key. When you are near him use execution move 2 times (not double slash)before he fully wakes up and screams. The outside guard won't know anything. IT ALWAYS WORKS!

MISSION EXECUTION EXAMPLES:

Assasination: Scout around the area. Try to take out the guy with dart rifle from far away and escape.

Sabotage object: If object is in the open or seen from far away, use your explosive crossbow, it's shot is silent and impact only causes alert. If object is in some kind of house or covered, sneak in plant IED's (these are glitchy to detonate so stick some and drop some) move away not too far for signal to work and detonate. If object is not explosive just shoot it with your MP5 or Silent Makarov and escape.

Steal item: Silently move in get the item and move out.

Once again for best result sneak around and try not to kill anyone. Because if you do, there's a high chanse that they would spot the bodies and you will need to kill most of them.

Good luck if your still playing this game.

Note: I am a fan of military simmulator ARMA 2. Thats why I have big patience in mission execution and I find this game playable with tactics.