Yikes, someone tone down the peen in this thread. It's clear who plays this game with the intention of being among the best and who doesn't. Comparing 20-0 scores when 16 of those kills are on "Mechwarriors" isn't showing anything except how highly you think of your abilities. Honestly, for people that play this game with a training/getting better mindset, it's very easy to go 15-0 or better, you know when to engage, you switch targets to the weakest threat available, etc.
With the exception of Snowball, I don't dread going up against anyone that plays this game. (His aim really is ridiculous) So please calm the swagger a bit.
And in response to whether people are cheating? No. There's just a vast disparity in skill between those new/casual to the game and those who intend to be very good at it. One way to note this obvious disparity is to look at any high scoring scoreboard. There could be someone 15-0 on both sides... now this doesn't make a lot of sense, until you consider that they're killing every poor player that runs beyond safe position. I find lately that my main goal when on one side of a situation like this, is to give that other guy some deaths. It is much harder, as you often very rarely see your counterpart, since you're both not doing death rushes into mobs, but the payoff is so much more worth it.
But to be fair to the high-scorers among us, it's not always due to turreting/sniping. I make flanking attacks right through the main line any time I think it's feasible. It's just not feasible on many maps because of the design. If there's a bottleneck with 6 enemy mechs at it, you're not going to flank them and be able to push through, your only choice is either light harassment or sniping.