i play Vietcong.
IMO its the most realistic game on the market, it requires a very good system to run, as they made the graphics engine themselves, but it is worth it, the jungle is immersive, the weapons, (when fully patches) are great and its got an "authentic" feel to it. this is one of two games i own (CoD is the other one) iv sold everything else as they dont match up to vietcong, Cod i will sell soon. but yeah, go VC!!