The game provides great milsim experience even if you just play the campaign alone. Finding a group of friends to play with, however, takes the experience to a whole new level.

Arma is not necessarily a 'walking simulator' or 'hardcore af' like it is often described to be. It is a military-themed sandbox, and if you spend a little time with zeus and all those mods created by the community, you can make the play style whatever you like and use your imagination to create scenarios for you and your friends to enjoy.