The miracle of the Cabal lies in her speed and maneuverability. With the proper skill, a cabal can move from one end of the map to the other faster than any other class in the game. You can teleport through walls, down ledges, behind enemies, and in and out of danger in an instant.
That's why her DoT attacks are so powerful; because done properly, you don't need to kill the enemies instantly, because you already know when you've hurt them enough to die from DoT, and you're moving on to the next spawn. By the time your allies get to the first spawn, they're seconds from death, and you're already at the next one, nuking them to death with poison attacks. Even better, with your massive speed, you can restock on grenades constantly.
The pattern is relatively simple; you run towards a crowd, firing your charge weapon as you go. When you get into range, you fire off a Nightshade Blades, staggering them; then you run in and poison strike twice, detonating your combos your weapon set up. Then you fire again while on cooldown, just before the Blades detonate, staggering them again, at which point you strike another two times, teleport through a wall, and disappear to the next spawn. With combined poison strike DR and Biotic Focus DR, you're taking half the damage you'd otherwise take, and with an adrenaline module you're tied with a drell for speed, while having twice the shields.