What rating is Call of Duty Modern Warfare 2?

The game will be rated M for mature, as rated by the ESRB due to violence and language as in 17+

Gamespot rates it 9.0 editor's choice and ESRB rates it Mature for Blood, Drug Reference, Intense Violence, Language for the Xbox 360, PS3, & PC and the PC version is only rated 8.5 Great by Gamespot rating
In the US it is rated M(17).