This update made this game similar to how Halo was set up. In Halo you hardly ever got a sniper/shotgun/rockets and when those weapons were available there were only one or sometimes two in the map. If you died you lost that weapon.
Same thing with Destiny now except you get to choose what weapon you want to use also special spawns often. I'm guessing most of the kids salty are the kids that rushed with Shotgun the whole game.
Adapt.
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Except in this game very few people start a match with the same weapons. If you run a slow shooting scout you would need a fusion to deal with rushers, and so on... That said, I am consistently having difficulty outgunning a side arm with an auto rifle at "close" range, and loosing with a hand cannon to the same side arm at medium to close range. A side arm should never be able to out damage an auto rifle or hand cannon. The issue is how under powered the vast majority of primary weapons are. People are not running side arms because they are great all of a sudden. It is because primary weapons mostly still suck. It is the core problem and nothing else really matters until that is changed.