If You Play PvP With an Unstable Connection, You Are Cheating
In Destiny, and CoD, lag gives an advantage to the person that is lagging, making them absorb bullets or teleport around the map, making it impossible for them to be killed. If you are playing PvP while this is happening, whether the intent is malicious or not, you are[b] CHEATING!!! [/b]
If you are unable to acquire a decent connection, don't play PvP. If you do, you are risking a ban for your unstable internet. Yes it sucks, yes it isn't fair, but life isn't fair.
If you think lagging gives the person an advantage then clearly you have never lagged before. The same thing that's happening on your screen with their guardian is happening on theirs. People are teleporting, bullets do nothing, and people are running into walls.