Well, I don't really think anybody was going to buy Far Cry 3 just for the multiplayer, it actually a reverse COD where you buy the game for the SP, although the MP is nice.
Far Cry 2's multiplayer was a big mess, I could never find a game on the internet, the only time I played it online was on a Himachi( or something like that) hosted lan game. We played at our lan a few times, but it nothing exceptional.
The SA gaming community is too small and too snobbish for such a game to work, unfortunately.