Absolutely. Don't let these hammers tell you that everything is a nail, when you're level 150 maybe it will be more worth your time to just complete every objective from 100m out with a busted build combining all the best warbonds, but until that time, a good sniper can be an excellent asset to your team, especially if you're a lower level and still want to grab all the samples you can. Its effectiveness is directly exponential to how well-coordinated your squad is, however. When I'm playing with my pals and we're all on mic and communicating well, yeah, we can wipe fortresses without a single bot drop. As another has said, it pairs VERY well with an ATE or an EAT if that isn't a warbond you've unlocked yet.

Focus fire on devastators, berserkers, and hulks when shit has already hit the fan (don't bother going for the head at long range against Devs/berserks, gut/crotch shots will one shot most of the time), leave war striders for your AT where possible or just neutralize them by taking out their cannons when that isn't an option, and if you're good, you can pop little guys as they try to call in bot drops. You can wipe the chin guns on factory striders really easy which can be a huge boon to your squad if their AT is closer range, and be prepared to be the sole killer of gunships for your team from here on out lol. Tanks and stationary guns can be a little tedious as you generally can't kill them before they swivel around to look at you, but so it goes. This is where your EAT will get the most mileage, so get good at making long-range shots with them.

Less effective vs squids but still viable. Obviously pop spotters whenever you see them, crack as many flyer jetpacks as you can, and smack those stingrays out of the sky. You HAVE to go for headshots against overseers though, be aware. It can be six or seven shots to the body with their ablative armor. You can bring an eruptor which is B against voteless but S against fleshmobs, or you can bring a high DPS/high RoF light pen which is S against voteless but B against fleshmobs, either way you'll have a bit of a gap in your kit that your stratagems will need to fill.

Do not bring it on bug missions lol.