6. Arma II
Arma 2 may be more than a couple of years old, but being developed for high-end computers that weren't even available at the time has its perks especially since every computer these days is capable of running the game at its highest settings—allowing the game to reach its full potential.
Vast and foreboding, the maps in Arma 2 span over 10km and are now home to threats worse than enemy soldiers thanks to the development of DayZ.