He is pretty trash in open maps, to be fair. That you were able to make him work is in spite of his kit, not because of it. Maybe you had a good game and popped the fuck off, maybe the enemy didn’t capitalize on you playing Junk. Usually though Junk is pretty bad against a team that knows what they’re doing because he needs to be pretty in you’re face to get good value and in open areas that’s just not optimal on a hero that can only either walk or minejump which makes them a sitting duck for hitscans.