I am new to this should I have thrown more grenades?
Maybe I am expecting too much

http://www.youtube.com/watch?v=BrctLJyHU6U
Warning the vid is a bit loud
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WTF are you talking about? You flanked the MG and achieved your goal - to move him off his position. He retreated almost immediately and was still a scrotum hair away from death. I don't see anything wrong here.
Do you think that well executed flanks should be insta-death?