You can get Jyn pretty fast and an all-Rogue One team can be pretty resilient in Arena, mostly due to the runaway health gain from Chaze also synergizing with Jyn's protection gain. And as Omeah said, you want K2 and Cassian to be throwing those debuffs everywhere (especially Cassian) and causing Expose everywhere (that K2 assists on Cassian and can occasionally give you a quick kill).
But I run Resistance and Rogue One teams are easy pickings for me because my Poe can get faster than most Jyns I face. Buff block and expose from Poe first, dispel from ResTrooper, and then Rey is dazing Chirrut or Baze so they don't counter, R2 is stunning someone or Burning them all (so Chirrut's cleanse doesn't give them all Tenacity Up), and generally it's game over from that point. I have the upper hand and the Resistance steamroller doesn't care about Jyn's protection recovery. :/
I've also heard that Jyn's protection recovery is great for Galactic War, though, letting the team build up turn meter between rounds and just recover health and protection non-stop through the end.