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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It's the aim assist on the Sniper weapons. Some have a higher assist than others, and now with the new perks, it make headshots easier. A player can be aiming several pixels away from actual head, and still get the hit as a crit head shot. It's Bungie's way of making this game more "accessible" for the casual gamers. :-/