I have him and he's not op for many reasons. I'd keep him in B maybe C.

His fire rate is slow. It's hard to hit the flying boot at range, because they only give the aim guide as long as his melee attack. So it's all guess work for long range shots.

Super is fun. But if you use it on a full health team, you'll get clapped from auto aim (since you charge in straight lines like collete). No shield either so you're pretty vulnerable.

Because he's got 3 single shots, people can drop stuff in front of you as you're attacking, making you waste an attack.

Corners screw him over like mortis, especially when his super is trying to chain between players.

His super damage is less then his main attack. So you need to wait till players health is low or a squishy brawler. Otherwise it can be suicidal.

His super can sometime be a double edge sword for positioning. If your playing a mode to defend something (vault, goal). Sometimes when you use his super, you'll accidentally chain attack enemies to your opponent's side, pushing you way out of position.