If your team is grouped enough for a fire-and-forget super to wipe then that's really on them. The problem with Blade Dancer's super is that thanks to how most maps are laid out you can easily kill half of the enemy team to all 6 of them if used correctly. If you're near a corner and a blade dancer or shotgun user is around the bend you don't stand a chance, and a good blade dancer can easily take advantage of that to avoid large confrontations that can blow them away. A warlock or a titan, meanwhile, has to time it just right for the perfect moment when the enemy team groups up or else it turns into a panic button.