It's realistic, althought hard to control but realistic. The amazing feeling of pulling something off after properly planning it and executing it with your mates/team is just fucking amazing. I used to play Arma 2 and Arma 2: DayZ Mod and it's Sub-Mods. Some of the best days of my gaming life have been meeting people on there, building bases and setting up a clan to destroy all other fuckbois.
Shit's golden if you put it to use properly. It's not a game for everyone.