First of all, welcome to the boards and well done. You seem to be smart enough to understand and respect the rules. Thats a very good thing. We dont get many kids your age with any kind of smarts. Keep it up and your bound to make some friends and more importantly gain the respect of the more senior members here who have seen far to many "l33t sn1p3r" types around here.
As for the actual question, My best experience was a cqb match with some friends where i went 26-6 (kill/death). I had some spectacular rushes and the best mercy kills I could have ever dreamt of.
~DEATH be not proud, though some have called thee Mighty and dreadfull, for, thou art not so, ~