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if your looking for a way to start off or improve your k/d this is an excellent video on what to do, this is only shown on one map but it gives a good idea of how to do it
[ame=
https://www.youtube.com/watch?v=RakTa6v1bmQ&feature]YouTube - MW2: Guide on How to get a good K/D Ratio - In depth - Must watch[/ame]
This video is showing basically camping in tight rooms with a shotgun pays off