Battlefield 3 combines infantry combat with mechanized warfare and includes transport vehicles, armored personnel carriers, main battle tanks, attack helicopters, and combat aircrafts—pretty much everything that goes into today's battlefields. Its infantry combat is coupled with role-playing elements, which makes the experience all the more engaging. It also has a single-player campaign that adds a few gigabytes to its installer.
Behind all this is the Frostbite 2 engine by EA-DICE. It makes use of every possible feature DirectX 11 has to offer, including hardware tessellation and new lighting effects, to deliver some of the most captivating visuals gamers have ever had access to. Not playing this game on the PC is a grave injustice to what's in store. Faster PCs are rewarded with better visuals.