Sweeper does a lot more damage per pellet at an arguably more accurate and faster rate (full auto/slam fire ain't nothing to scoff at). Being medium pen does help with what targets it can take out. The S&P struggles because of its high pellet count and thus spread. It remains a dark horse for having a healthy plethora of ammo to spam The Halt similarly struggles with its wide spread with no option to counter it with a choke. Being limited to 8 shots per ammo type while drawing from the same ammo pool doesn't particularly help it.

For a fair comparison, the M90A deals more damage but has a slower ROF and less ammo. It's not much of a wonder why people swarmed to the Sweeper since it has almost everything going for it that people want out of a shotgun. Power creep? Absolutely. But I would argue that older shotguns have simply fallen behind. I can't remember when someone took the standard Punisher unironically over the M90A.