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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Don't know if OP will even see this but it might be the sniper you're using. I felt the same way at the start of my crucible venture and found Praedyth's Revenge is almost identical to the Halo 2 human sniper from a mechanics standpoint. Handles the same, has similar RoF and target aquisition with 2 body shot kills. Obviously H2 sniper didn't have firefly but you get the point..