If you go to your Playercard, then leaderboards, you can then filter the leaderboard to show all players. Scroll to the top of any leaderboard and 99% of the time it's plagued by people with stats that normally would be impossible to obtain. So when you click this person, you can view their recent games and watch their games with the Theater mode. The first top3 people I viewed their games, on every leaderboard. Every game contained boosters, abusing the Split screen Online Multiplayer function, or with friends. It usually consisted of 1 or 2 players doing the Killing, while the rest lay down a tactical insertion and shoot in the air, so their friends can find them, collect the headshot kill and they repeat this over and over until the game finishes.

I watched about 20 games from the top3 of every leaderboard (except free for all), all of them were boosters. Do your part and go to the leaderboards, click the player and report them for boosting. It's out of hand.

It's sad tho, Treyarch has "reset" some of the boosters, yet they still are boosting again, right now. What are the plans to combat this? They're obviously not been banned for it, only reset rank. A clan called "MaFia" are the main boosters who are plaguing the leaderboards.

http://www.youtube.com/watch?v=zJhwDsArjzs