I'm too imperfect to have ever got a perfection. But I once got 32 kills +19 in a standard first to 50 slayer match. I'm nothing special, k/d 0.83, BPR 43. It was just a game where most things went just right. but there are still many, many mistakes during play. For example at one point I get a triple kill but don't notice my sword has run out I'm too busy looking for the next player to kill on my radar.
Here is the game I'm referring to. If you are really good watch for a laugh if you like. If you're not maybe watch for inspiration on how you (almost anyone) can get a game like that. A lot of it is knowing where the weapons are and when they might be there and reading the radar precisely so you know exactly where every player is on the map and trying to suppose what weapons they have. I have a +17 (27 in total) in my fileshare from yesterday or the day before too. I'm not good at not dying, just killing.
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I once saw a guy go 40 kills +38 (again standard first to 50), Snip3r or something like that. He was not human. I was -11 with 4 kills (but 2 of those were him if that counts for anything). I think I was the best player on my team, that's how bad it was. Just 1 guy, the rest were cannon fodder but you couldn't get at them. He killed me about 6 or 7 times with exactly 4 DMR shots, I didn't even know that was possible.
[Edited on 07.02.2012 3:53 PM PDT]