Some players might be cheating, some others might be just downloading or having family at home using the Internet too, but most of the time the lag fest is simply due to P2P technology. I mean how can we expect quality with p2p. That's just literally incompatible. Destiny will always be like that, putting the weight on our consoles, instead of on their servers. So some games will be playable, others will turn our attacks into wind, making us die with what looks like a one or two shot on our side but a 20 shot on the attackers side... That's also bungie's way to ensure that everyone can be legend.