Here are some games you should try out, Resistance, any of the 3, Gears of war, any of the 3, Star Wars Battlefront2, War Inc, Uncharted Drake's Fortune, Uncharted 2 or Uncharted 3, Infamous or Infamous 2,Mount&Blade: Warband (Not the first one because it's only single player and they added an new faction in Warband)World In COnflict, Warhammer Dawn of War, Any Stronghold game,Any Age of Empires, Empire Total War,The Sims, Any Assassin's Creed (There all awesome) The Lord of the Rings Online, Star Wars Republic Commando, and I saved one of the best games for last World of Warcraft. (One of the best games is Assassin's Creed, Assassin's Creed 2, Assassin's Creed Brotherhood, Brotherhood is part 2 of Assassin's Creed 2, and the newest one that came out for the PC this month! Assassin's Creed Revelations.)
The picture is from Resistance Fall of Man and Resistance 2, this SRPA Black Ops units go into hiding or get all killed fighting back in Resistance 3, you will only find there bodies around the place in this one city, if you are not careful, you will join them.