You wake up in a shack in the middle of the jungle. You check your map, looking for places you could get a mission (cell towers? arms dealer? warring factions? underground? mercs?). You choose one.
You set out by foot, but get ambushed by a truck with a mounted machine gun. You kill the driver and gunner, steal the truck, and drive off. Back on your way, you spot a road block ahead. You stop the truck, get behind the mounted gun, and let loose. You hit an arms cache, which explodes like fireworks, sending bullets everywhere. A firefight erupts. You wipe the camp out, finding a lone, wounded survivor propped up behind a tree, dying. He tries to pull his pistol. You sink your machete into his chest.
Back on the road now, you're driving along when you diamond gps lights up. You leave the road, hoofing it into the undergrowth. You find the diamond near the wreckage of a bus that tumbled down the ravine, but you also spot a guarded compound nearby. After scoping the place from a safe vantage, you launch your assault but get overzealous with the molotov cocktails. As flames engulf the entire ravine, you're cut down by an enemy who retreated to the tree line. You hit the ground, but don't die. You vision goes in and out as an a.i. buddy arrives, and drags you out of the combat. You're revived a few feet away safely behind a rock. You head back in with your a.i. buddy to finish the fight. You find health packs, and free a prisoner. They tell you to meet them later for a mission.
This newly freed compound is near the river, and you realize you could finish the journey to the mission start by boat. So down the river you go. Your diamond gps goes off again, but you can't seem to locate this one. You encounter an enemy patrol boat, and though you finish them off easily, they've damaged your engine. After repairing the boat, you finally make it to the bar where your mission awaits. But first you stop into the arms dealing to spend your diamonds on new weapons, or maybe an upgrade for your existing ones.
Finally, 45 minutes after you set out, you enter Mike's bar to get your mission.
If that sounds awesome to you, then the awesome game is awesome.