I consider myself a decent sniper, but when I go into Crucible, I'm wrecked beyond belief. There are guys who headshot me the very second they scope in. It's -blam!-ing ridiculous! I don't understand how they do it!
EDIT: A lot of people are saying that they get their skill from Halo. However, I actually snipe very well in Halo, but not-so-well in Destiny.
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I was the designated Sniper (per say) on my Halo GB team and I was always first person to rush Sniper in most games. The mechanics in Destiny are essentially identical to Halo, just with different stats per sniper. The whole aiming for headshot thing becomes second nature after playing Halo.