User blog comment:Imrlybord7/How to be amazing at Call of Duty (really)/@comment-4122733-20120610103041

10. Have the best connection in the lobby. (Most important).

The other thing you missed out was having the right class for the right map. For example, in Afghan a sniper or AR are the best for medium- long range engagements, but on Skidrow a Shotgun or SMG are better suited for CQB. Obv you can do well with anything, but these weapon classes suit the map more.