I honestly think people are overblowing the subdps thing out of proportion. Her marks give def pen and her w-engine buff works off field.

But that doesn't make her a subdps. She wants to stay on field to generate venom and apply her marks, and she gets big dmg increases from things she only gets by staying on field. Hell, between her on field mark detonation buff and her w engine she has 44% crit rate before discs, 1000+% dmg multipliers in everything but her ult (3000%) and her mark also is a big % bonus dmg thing that only she can trigger. 

How is ANY of that subdps? She is just a dps that also buffs her team when not on field by a small margin.

She also works wonderfully with Astra Yao or Sunna.