Value of mission rankings.

[Hell Heart]

I personally dont care that much when it comes to mission ranks as you'd probably just need a Tank with Ready weapons and out DPS everything else which doesnt require much skill IMO. It does take a bit of time and experience getting your playstyle together and if you have a willing team to run mock battles as they can be a bit more merciful instead of going straight to free battles does help a lot based on my experience.