Problem is there isn't really anything to do in Destiny's PvP except shoot or be shot at, so hit detection and who is lagging and who isn't means everything. It's a consequence of having a handful of players on a tiny map. A la CoD. Maps need to be bigger, player count needs to be higher, new game modes added, but most importantly there needs to be more roles to play. Players that aren't good at shooting might do great as a support class (like healing, hacking, infiltrating, etc.), if the game had them.