Well, I only run snipers in the crucible. What you need to know first is that, in normal crucible, it is always better to use a low impact sniper instead of a slow firing high impact sniper rifle. So you can counter auto rifles or cannons in tight situations. Headshots are instant kills, no matter which sniper you use (exception: overshielded players). Also, while there are few big maps in PvP, most maps are designed for fast CQC encounters. That's why a short-range scope on a sniper is almost a must. It really helps. Some sniper riflles only offer mid and long range scopes (they are randomly selected on non-exotic guns and, if it's a HoW legendary, can change when you reforge the gun). And most low impact snipes have high RoF and at least 4 shots per mag, high stability. The Patience and Time exotic sniper is a prime example of a sniper designed for PvP. Aside from that, you need to stay mobile. This is important. Sure, you can camp on one spot. But as soon as you score a kill, enemy players will see you during the death-cam. On the map you mentioned, Maat Moons, you should always rush to B and snipe people coming from the small tunnel. If you start on the other side, rush the tunnel and snipe the ramp. Also another good sniping spot is C to B and vice versa.