A bullet with your name on it.
Overall the game feels like it was written for console gaming. Don't use your brain, get mission, shoot a-holes in run-and-gun style, get reward, repeat...
Other letdowns include encounters that are located in static locations with an infinite number of spawning enemies. A totally unrealistic physics and combat model better suited to low budget quake ripoffs. Why not just put Unreal tournament's weapons in there. It would be an improvement, trust me. Maybe those high-tech weapons wouldn't degrade within hours, becoming jam prone rusty relics that look like they've been buried in mud for 10 years.
The AI is way beyond stupid. It seems everyone in Far Cry 2 was smoking waaaaaaay too much crack, which might explain the reason why it takes numerous high powered rounds to bring down an enemy. Apparently smoking crack gives you super powers such as bulletproof skin, x-ray vision and the patented long-range sharpshooter with a shotgun skill. I so wish I could smoke crack in Far Cry 2, instead of chugging down those freaking malaria pills. Which leads me to another point, why do you have to play a malaria ridden cripple? Why not just give the main character aids as well? Maybe that would bring some depth to the paperthin 1 dimensional plot... Now where did I put those anti-retrovirals?
The only memorable gem that I will take away from Far Cry 2 is the hilariously funny things that the stereotypical white Afrikaner mercenaries hurl at you while trying to kill you.
"Every one of these bullets has your name on them!" to which I reply, "Every one of my bullets has your name on them because that's how many rounds it'll take to drop your sorry a$$!"
Final comment: Monumental FAIL.