"Sweet spot" is a useless mechanic. There's no way to tell if an enemy is within range.
Incorrect. If you're the one shooting, you can easily mark a point on the map and it'll tell you the distance to the target. It'll also work if you use other tools such as a rangefinder. If you are the one getting shot, if the sniper is in the sweet spot, the scope glint has a different color.
Instead of sweet spot, you need a one-hit kill from the torso at close range, like 0-30m. So, it should be like BF3-BF4-BC2.
Bad Company 2: I believe it had a magnum ammunition specialization that would increase the damage by about 25%. Allowing for one-shots up to about 40 meters in any body part, I believe? It could be countered by ceramic body armor. This made it highly inconsistent.
Battlefield 3: I don't remember sniper rifles having the ability to one-shot people at close range, but I could be wrong about that.
Battlefield 4: It had 100 damage at 0 to about 12 meters before the damage dropped off. I might be off by 1 or 2 meters, but it didn't extend to 30m. As far as I can tell, the chest plate specialization did prevent you from getting close range kills, making it highly inconsistent as well.
It didn't really stand out to me as a proper way to balance the game. The idea that you need some sort of gadget to counteract the gadgets of an opponent just leads to inconsistent gameplay. It also seems quite strong to have a sniper rifle that's able to instantly kill people up to 30 meters. In the hands of a competitive player, that can easily lead to issues.
Instead I'd prefer the option of using a fast firing, fast ADS time sniper rifle, combined with fast pistol draw times. That way you can either quickly place a follow-up shot, or you can do the one-two punch where you hit people with a sniper shot, followed by a pistol shot.
Additionally, sweet spot mechanic that forces players to camping from a distance.
As we've seen in Battlefield 1, different weapons had different sweet spot ranges. You could easily make the sweet spot inside of a 80 meter range, where you're quite vulnerable to the other weapon classes. Don't get me wrong though, I don't particularly like the sweet spot mechanic. I think it's not particularly fun to be at the receiving end of somebody that just manages to kill you just because they stand at a specific range from you.
