JNasty720- IMO tied with the title of 'best CoD player' with Insomulus. He has gotten two penta moabs during MW3 and has put out tons of 100+'s playing solo. His channel- http://www.youtube.com/user/jnasty720
Insomulus- The other player who is as good as JNasty720. He has incredible aim and plays on a 10, or now 14. He almost got a Quad Moab without Support and uploads plenty of 100+'s. His channel- http://www.youtube.com/user/insomulus
Jars Armada- I've personally played with this guy a lot. He was all over the leaderboards during Black Ops under the gamertag 'z Jars'. He's just as good as ever at this game. He mostly plays League Play. He doesn't that upload often though. His channel- http://www.youtube.com/user/jarsarmada
All 3 of these people seem unreal. Their aim is so perfect. Jnasty plays on what? 8? and Insomulus plays on 14.