Arma-1 has all the features of OFP, Arma-2, Arma-2, The main feature of whole series is powerfull editor and complex script commands. All this is available in Arma-1. I declare responsibly, the main thing in any of the games in this series - good missions. And there's nothing wrong with Arma 1. Courageously buy it and you will get full satisfaction from the game. There are missions that aren't and won't be found in newer versions of the game, that's for sure.
