@Trystan_Spyder disagree that Revan's leader ability "humiliates" nest. With the right modding and leadership ability (Qira) I had some of my most fun (and simultaneously uncomfortable) arena matches ever in this game.
The fun bit was watching nest (towards the end of the battle) on her own and on auto 1 shooting everyone on a Revan team often multiple times because of Jolies annoying revive and winning with a single slice of health but full protection. Uncomfortable because of the pure cheese involved in the tactic didn't sit right especially when shard mates who had just bought revan were asking me to remove mods from nest because they couldn't kill her.
She is a lot less reliable as a counter now since people worked out how to mod bastila and GMY on a Revan team and eventually worked out that the zeta on direct focus was the important one. Still works okay though if you find a Revan and bastila with low potency or a GMY with low offence.
You can also add her to a few other teams (JTR, Traya...) and eek out a win because she adds alot.
@furyousgeorge74 I'm not sure I understood 1 sentence in your post about stuns... Stunning nest is crucial in efficiently beating her, if you stun her she can't counterattack and regain health. The only other good option is healing immunity but then you still take damage from her counters.