There is not a 'best player in the world'. Each player has their own style for which contributes to different things. For example, so people would rather keep an equal kill/death ratio and some people would rather win matches, keep their accuracy up etc. On Xbox, PS3 and PC, some of the most equal overall players are not recognised because of the large amount of hackers, modders and others on the consoles. Call of Duty: Modern Warfare 2 and most other games are not about being the best at them, but making sure you have fun on them.
No. None of the Modern Warfare series have been 2 player online (aka. online split screen).
RougeMOIII or L97h two of the best MW players on the leaderboards.
You can't, modern warfare 2 has only one player online but it has splitscreen which is only local play.
No
In Spec Ops, yea.
There is no two player online for mw2 on ps3 or xbox 360
Modern Warfare is 2 player.
yu cant only in mw3
No, but you can play 2-player online in Special Ops.
no only if you log into your account but player number 2 whont get those guns that you have on your account
invite them
Yes, online and offline.