When I was first introduced to the Call of Duty series Infinity Ward had just released Call of Duty 4: Modern Warfare. Lot's of fun, put my old favorite PlayStation title SOCOM to shame. Then I played the beta of the upcoming Call of Duty: World at War by Treyarch. It was ok, nothing compared to Modern Warfare, plus I had heard that IW was far superior to Treyarch. That being said I passed up on World at War. Modern Warfare 2 was the return of Infinity Ward and got my attention immediately due to IW making this new version of COD. Modern Warfare 2 was a lot of fun just like COD4 but was a HUGE upgrade from 4.