It's a very competitive rifle at the moment, but Bungie has more or less said that it's getting nerfed because everybody's using it - and they don't want everybody using the same gun.
So why can the ONLY possible solution in the ENTIRE universe be to nerf the Suros? It's not good because it's overpowered; it's good because it's user friendly. It has ammo conservation by firing slower for more damage, it has accuracy which is an absolute must in PVP since headshots are the only ones that matter. It has range, which is also sometimes helpful in PvP although everybody hates the Moon and Mars giant maps... Bottom line, the gun isn't actually OP, it's just one of a few guns that actually does what it is supposed to.
My suggestion would be DON'T nerf Surso; iust bring underperforming guns up to its level *cough* scout rifles *cough* pulse rifles. I don't particularly like the Suros, but it should not become a rubber-band flinging paperweight.
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It's to popular. It's the most desirable Auto Rifle in the game for PVE and PVP and according to Bungie Auto Rifle's are already way more popular than the other primary weapons. And by Bungie's own admission, if one weapon ( or one weapon type ) outshines everything else then that means it's unbalanced.