You know, I will have to agree with you now after my last match...
I have noticed recently that players in the Ranked matches are playing more and more dirty - chainsaw glitches, and now even cheats that allow you to sprint and fire at the same time. It was bearable, until my last match. 2 people were cheating, and was just sitting there on purpose on the spawn point not doing anything. He was there playing, because his excuse was "I'm new to this game".

Once or twice he even ran and stood infront of one of us, just so we could shoot him. One of the 12 year olds wouldn't stop shouting "WOOOOOOOO!" down the microphone, and constantly told us not to kill anyone in his sight. In the end people were just being VERY unsporting - stealing each other's kills - so I started stealing some of their kills, as I wouldn't have stood a chance.
It's a real shame, as I've had some fantastic sporting matches with people in the past. Now you're getting more of the itty gritty people that aren't taking it as seriously as the game was when it was first released.