@MW3Updates has shared a link on twitter to a picture which contains statistical information about all the weapons in Modern Warfare 3.
Take a look at the image below, it yeilds some interesting findings! For example I now know that clearly the ACR is rated as one of the best guns in the game! The ones about the sniper rifles are also interesting, the ones that get 1 shot-1 kill’s all the time. Although I personally seem to keep sniping folk with my Barrett and not killing them! (Note to self, stop aiming at their feet!).