As a team, I wouldn't bother with them to a serious degree.
Having lucked into a bunch of her shards, I did bump NSI up to 7*/80/GL 8. She takes a pretty considerable beating, her ability block is fairly useful (50%, haven't omega'd it to 65%) if slow on the cooldown, and she hits reasonably hard for a 'normal' (read: non-Rey style "hits for ____-you levels of damage") character.
The lack of particularly powerful (read: broken) abilities or synergy makes her an addendum to some of my squads. She can last in the GW for a good while when I'm just clearing out the chaff, but doesn't hit hard enough to really dent the big dogs (RG, I'm looking at you), nor actually tough enough to survive more than a love tap from a GW buffed Rey.
Haven't seem them in a while, but I did face some Dooku/Daka/RG/Rey teams that were just absurd, but that was a while back, the meta or GW formula seems to have shifted a bit since then. Her double stun was/is one of the most obnoxious in the game. I think a few had Phasma in there too, and the right explosion of bonus attacks led to having 3+ characters stunned at once more than a few times.