I've done a bit of testing in arena. Unfortunately, badstilla doesn't add enough survivability to my 5 star traya even with a crit avoidance arrow on traya to survive against fast revan teams.
I haven't tried against anything else because ep, triumvirate, and thrawn walks over anything else in my arena. And against the semi fast reven teams subing in tarkin for the leader to make thrawn faster is much more reliable.
But I do have her at g11 and use her in ga under traya lead in a sith team. That allows me to have a decent sith team under traya and a A grade empire team under ep and vader.
Once I get traya starred up and g12, she may help counter revan better but until then she has her uses.