For me, I don't think there was a single gun in this game I found useless! As for the best, I think it might be the Proton Drum. It just keeps on knocking any enemies near it off their feet and when fully upgraded it could clear out entire rooms/areas! It's just so hilarious and satisfying watching that thing in action.
But enough about my choice. What's yours?
What did Little Coco ever do to you, 2016 Game Awards?