The two main tips I'd give would be:
Strafe, and do it well.
Play smart. The difference between the top Xbox Live Warriors and your run of the mill players is that the majority of the time I will know what you're doing. I know where you'll go, where you'll run to. If I have time to watch people a bit i'll know what they'll do 90% of the time. This leads to easy nade kills and much more.
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