They are going beyond there "intended role" Because of the map layouts on the maps that are used in the rotations, snipers are the strongest weapons to use because their range goes from one side of the map to the other, with 0 damage drop off. The weapons them selves are not as OP as people say, except for the fact that even staggered they can get headshots, and the fact that they can res snipe, which is one of the cheapest thing about them, but it is the map layouts that make them more OP then they really are. If there was any kind of damage drop like in every single weapon in the game, then they would be much more balanced and fit their "intended role"