Having had to use Fina for such a long time due to her Cheer ability was a huge crutch for me starting out. I had rolled Roselia before now, but her lack of Cheer and lack of overall ATK AoE buffs convinced me to let Fina stay in the lineup. Once I rolled Ramza and had another unit with Cheer it was an amazing change in survivability once I was able to move away from her and onto a healer with Curaja.

I recently rolled Garnet and Lenna. After I hear the news of their 6* and determine if their LB is worth anything (Hopefully the news comes sooner rather than later) I'll be able to raise them up and get even better healers.

Fina isn't bad, but you can definitely feel her power drop off the charts as days pass by in our game. I recommend that you guys, along with tanks and whatever else makes your team balanced and ready for new content, are able to drop Fina like I did and observe the difference in performance between her and the Rare Summon healers.