Honestly, majority of these guys have to be lying. 80/90 kills in one match? whatever.
My 61/7 was in CTF, and even then I had to use 2 chopper gunners, and a SHITLOAD of predator missiles (which is REALLY useful on Wasteland, since it's predictable where everyone's going to be). Outside of that, there's no way you can realistically get 70+ kills.
One other thing, in this new COD, it's *easier* to kill others. Which is HARDER for good players to rack up kills, because even newbs will get kills one way or another eventually. Unlike KillZone2, which it was much harder to kill (so there were either awesome players, or a bunch of crappy players; there was little middleground).
In conclusion: waste of a post I don't even know why I bothered