Any brain dead idiot can sit on a mountain and shoot at the occasional enemy that enters their line of sight. Sniper rifles in this game use hit scan, so no, it doesn't take skill to use one.

I'd say (speaking as a frequent sniper myself) that as a dedicated sniper, you need the most skill to turn the tide of a match.

Snipers are very good at killing. They are not so good at turning the tide of battle, and a close-quarters battle with everybody dancing around everybody else is rarely going to have a different outcome because you were shooting into it. Not "never," but rarely.

As a sniper, the most vital function you typically perform for your team is taking out hostile snipers so that they can do their jobs unmolested. This does take skill (and some understanding of how the map works and why-- beware the misnamed "head glitch"), but, because snipers are typically motionless, the easiest prey for a sniper is another sniper.

What takes the most skill? Eh ... it depends on who you ask. Every role in DUST requires a goodly dose of it; this is not a forgiving game. Even heavies tend to die horribly if they get in over their heads, which they find easy to do.

I suppose the best answer to the question, "What takes the most skill?" is another question:

"At what?"

If your reticle is over the enemy when you fire, you will hit them.

No bullet drop, no travel time, you just hit.

Have you ever been anywhere on the internet where this isn't the case?

Like, EVER?