Doesn't Barris's heal HURT other characters?

It is true that it hurts a bit, but if used right it won't be much. I prefer to have three with close to full health for the heal, and it's pretty easy for Bariss to be near full because she has massive hp and usually considered a low priority target. Most of the time I can bring toons back from the brink of death with her. In arena however, Luminara is better because her heal is just as good and she does way more damage. Bariss is amazing in GW though. With her as leader, I can usually maintain a squad with nearly full health to the end.