#5 Call of Duty: Modern Warfare
Call of Duty 4: Modern Warfare is a 2007 wartime FPS which takes a left turn from the rest of the series in that it offers the player modern wartime themes, settings and equipment.
The Infinity Ward-developed shooter also introduces a number of new gameplay features, with perhaps the most notable being the “killstreak.” The “killstreak” feature in the multiplayer area of the game, which tallies the amount of kills a player achieves without dying.