17. Call of Duty 4: Modern Warfare (PC, also on PS3 & 360)
As a fan of Call of Duty from the very beginning, this game was the pinnacle of the series for me and showed off everything the franchise can be. Moving the time period from the over-done world war II setting to the modern day (meaning some very cool weaponry and varied gameplay) yet still retaining everything that made Call of Duty 1 & 2 great; a glorious single player campaign combined with a superb multiplayer.
The single-player campaign, whilst relatively short, is perhaps one of the most memorable and shocking. A solid narrative pushed you along, but added some truly shocking moments not seen in video games that made full use of the first-person perspective (nuke anyone?). The multiplaer in Call of Duty has always been good, and CoD4 was no different. New weaponry and a levelling system added to solid CoD gameplay. In many ways, this was the last (and arguably only) Call of Duty game to truly innovate.
