Snipers are basically pointless in this game

Snipers are simply very situational, and when you decide to carry one you definitely need to carefully pick your 2nd weapon.

In a 3-man squad, a sniper can be useful to apply pressure and lock down a team to a specific building, allowing the rest of your team to push them into a corner and take the upperhand.

As the Bangalore boasted so excellently earlier, you can trigger her smoke, revealing her location quite quickly, allowing your team to pinpoint her location, and chuck a grenade-rain in there. Should she decide to run, you have another few shots lined up.

However, you need to make a difficult decision that prevents you from either sitting still too long, and switch your weapon for close range to join your team. You need to weigh the positives and negatives quickly of giving up your overwatch position.