2nd the person who takes the deaths guarentees a loss for the team. how is that not ruining peoples games. people want to try and win except the cheaters.
Cheating in this sense is subjective. Yes, they are "cheating" the game, but in this case, they are only cheating themselves out of the game's experience. Do they earn things that give them an advantage? No. Unless you're going to say that they're going for OP weapons, which isn't even really big in BO2.
Um... I'm pretty sure they're trying to boost in a way that they fill the entire lobby with boosters. That way, no outside people's games are affected.