Ratings depend on the game and the Platform. Most Call of Duty are M or T or rated 8.5 or higher for those type Gamespot type ratings
Call of duty
Call of Duty Ghosts - 2013 VG is rated/received certificates of: Singapore:ADV
All the Call of Duties are rated "M" for mature. (ages 17+)
Call of Duty ELITE Friday Night Fights - 2011 is rated/received certificates of: USA:M
Call of Duty 3 - 2006 VG is rated/received certificates of: Australia:MA New Zealand:R16 UK:15 USA:T
Call of Duty Finest Hour - 2004 VG is rated/received certificates of: Australia:MA New Zealand:R16 UK:15 USA:T
call of duty finest hour call of duty 2 call of duty 3 call of duty world at war call of duty black ops call of duty 4 modern warfare call of duty modern warfare 2 call of duty modern warfare 3
the call of duty games for wii are call of duty world at war,call of duty modern warefare and call of duty black ops
Call of Duty 2 - 2005 VG is rated/received certificates of: Australia:MA New Zealand:R16 South Korea:15 UK:15 USA:T
Call of Duty Call of Duty Big Red One Call of Duty 2 Call of Duty 3 Call of Duty 4: Modern Warfare Call of Duty: World at War Call of Duty: Modern Warfare 2 Call of Duty: Black Ops Call of Duty: Modern Warfare 3
Call of Duty classic Call of Duty 4 Modern Warfare Call of Duty World at War Call of Duty Modern Warfare 2 call of duty black ops call of duty modern warfare 3
Call of Duty in 2003