No not everybody should or will have fun. Life isn't about fair, it's about working to get something better then the next guy, weather skill or luck. When people win the lotto do they say "that's not fair I want everyone to win so I will give everyone's money back", when you get a promotion do you refuse because people lost out on that job? No you count your blessings and move on.
If he got an absolute trash gun from the raid and posted himself going 4 and 24 would people be saying "that's not fair"? No they'd be in here laughing at him for working so hard for nothing, and telling him to suck it up.
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Lack of skill would be the most denominating factor in that example of yours. Not his gun. Regardless of what your ideals are in a video game, the point of it is for people to have fun. The gun will get nerfed in PvP, obviously. Give it a few days or a week and all fusion rifles will. I guarantee it.
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Then it will need to be sniper rifles, then scout rifles, then pulse rifles, then auto rifles again, then maybe hand cannons, then shotguns again, and so on and so on. Something will always be "the best" choice. As long as pve players are forced into the crucible for bounties they will use the most effective means to complete it, as fast as possible, so they can get back to pve.
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So long as things remained balanced. Whoever handles the patches agrees.