I think what you are experiencing is a side affect of a couple of things. Fusion rifles are not hit detection guns like most of the crucible guns(pull the trigger, and if cross hair is over target, a hit is detected). Fusion rifles fire fast moving projectiles that leave the gun, have a travel time, and if they cross paths with en enemy will attempt to register a hit. This bolt travel time coupled with latency is where you get your issue. Taking into account the current state of the crucible, when firing a fusion rifle at basically any moving target if you are in a game experiencing any amount of lag, you will miss. Where as the hit detection weapons usually just register the hit a bit late... the fusion rifles with bullet travel time requiring collision with a target will generally just see a miss. If they can manage to pull their heads out of their asses and fix the crucible it will help out with these issues... along with a fix to the fusion rifle stability they totally -blam!-ed and fusion rifles should be good to go. Unless of course your target has been standing perfectly still for a few seconds.... if it's missing at that point then it's something else.