I've been playing since mid Dec. I have 35-ish toons now but never had Barriss. Kept hoping to pull her from a Bronzium but best I ever got from that was Ahsoka a month back. Finally decided to go after Barriss strictly for GW and just to see what she was about actually using her vs. seeing her on defense. I know she hits like a wet noodle but that heal!
Just got her this morning. Leveled her up to 66 (my A and B team are 70) and got her to Gear 6 with 3 slots to go for 7. Abilities are 5, 5, 5, 3.
So a "mediocre" 4 star Barriss at Level 66 and blue gear...
Stuck her in lead with Lumi and JC. Added GS and RP. I nearly ran the full GW with zero retreats! From node 7 on I start seeing the Level 70 purple teams arrive. I have finished the majority of my GW's for a while now but that was with retreats, suicide squads, etc. My last few days I was down to a couple toons at the end of things. Today I only lost Barriss and that was at Node 11 and I knew I just had one node left (and it was a hard battle). The only thing I had to do was swap out RP for Dooku against the Jedi heavy teams.
One really nice added bonus. My last node was a 70, 7* purple team with Yoda and Rey. I used that as training since my entire roster minus Barriss was at full health! They both can give me fits with what feels like constant foresight up so I cant touch them. I actually still have that battle up so I can try more squads out. I got shredded more than a few times but that is why I am keeping the battle going.
So if you are on the fence about Barriss, go get her even for just GW! Triple heals with two DPS makes GW enjoyable again. I plan on at least getting her to purple gear but she is pretty viable just at 4*.