I think their fine the way they are! If Bungie buffs them people will go back and use a fusion rifle the whole game like they did before. You should not be able to one shot somebody from halfway across a map. Fusion rifles are fine the way they are and should not become a OP noob weapon.
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Fusion rifles don't one shot outside of shotgun range unless you are really lucky. This means they cannot compete, and they don't have the charge time to compete with a primary at medium range specifically because they do not one shot. Seeing as they are designed for medium range, it is a problem that they can't be effective at this range (at least not the old ones since they were just nerfed). I will withhold my judgement on the nerf as a whole though until I see the current design for fusion rifles.
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High impact, high range fusion rifles will. Like Preatorian Foil.
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As they should due to their painfully long charge rate.
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Like stated above, this post is mainly for PVE. With minor adjustments fusions could be viable in PVP.