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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Sniping is super easy in this game compared to some others, the only difficult thing is if someone hits you with thorn before you can aim properly. (At least for me) Just find a good spot, aim about where their head is going to be... and then poke out