Bandit is a great operator if you play as him correctly.
First of, he has great weapons, but I have found his mp7 SMG most effective. His M870 pump action shotgun is good, but I strongly recommend using his mp7 SMG. For his mp7, don't use a reflex or red dot sight. Use a holographic sight and muzzle brake if you want to roam, and if you want to camp the objective, use an ACOG sight and suppressor. Next, his secondary gadgets are barbed wire and C4. A C4 is for an aggressive playstile, or if you want to sing troll la la la la la la to blitz, Montagne, possibly Fuze, or certain recruits. Barbed wire is good if you have a silent playstile, as you could put your primary gadget on it, and deal damage. Barbed wire is a simple and useful secondary gadget. Finally, his main gadget is shock wire. You can place it on reinforced walls, barbed wire, and deployable sheilds. It can change the tide of a battle by destroying thermite charges, X-kairos pellets, drones, and you can even get kills with it.