Helldivers 2

No backpack for one. A shield gen is great for survivability, a jump pack is godlike for getting into places where nothing can get you. Shuttle defenses become a breeze with quasar + jump pack, since you don't need to restock its ammo (you can't drop stuff on mountains and cliffs, it bounces off). Three people with quasars can reliably shut down a bot drop by shooting dropship engines, you can kinda do it in two, but sometimes there is like 5 or 7 drop ships and you need to grab some air, or someone misses. Also tanks get dropped and always survive the drop even if you frag the dropship, so someone needs to fire a shot or two at them. One hit on the charger, easily takes out bile titans, tanks and the dreadnought-looking enemies (with a possible one shot to the battery or the tiny head on the front). You can use it on annoying enemies of "lower" threat level too, since yaknow infinite ammo. The downside takes a tiny bit of getting used to, but after using it for a day or two, you are just as effective with it as with EAT's, but you don't only get two shots.

Plenty to like about this weapon when running AT.