Veteran Helldivers, What Are Some Initially Awful Weapons/Equipment/Strategems That You Now Love?

On release, the Exploding Crossbow was pretty much a joke. Small AOE, 2-handed, low damage, and for whatever reason it couldn't even blow the door off a POI closet. Now it seems reliable against all fronts, with great predictable explosions and stagger. Being one-handed makes it great for carrying black boxes and SSSD drives. It's silent firing (despite projectile exploding on impact) also lowers detection by enemies. The Machine Gun Sentry was okay at launch as a low level turret option, but having the same cooldown as other turrets made it quickly obsolete. The huge cooldown reduction it later received now makes it one of the most useful strategems in the game, as there is little risk in using it since it will be off cooldown again quickly. Curious what other gear/strategem glow-ups have changed your mind about their usefulness.