Bangalore in particular is good and has the ability to launch smoke, and Caustic has gas that makes it harder to see. You have a huge advantage with your ultimate and tactical ability in being able to see through smoke or poison. You are best paired with a character that can obscure the environment.This gives you nice flanking opportunities. It lasts quite a while and you can cover a ton of ground before they realize you are on top of them. Use your ultimate from a bit further away from your enemy than you would think.Knowing what type of weaponry you are up against may alter your play-style. While they mostly identify enemy movements, you can learn what kind of weapon has been used by checking the spent casings or what was used to eliminate a player. Keep a close eye on the clues you'll find on the ground.
If you are trying to remain hidden, don't use the ability! This is an iffy way to play, but the ultimate combined with the heavy damage of the shotgun works well together. If you are an aggressive player then the Beast of the Hunt ultimate works well with this play-style and you can run in and shotgun people down.
