Can take a player by surprise, but let's be honest, if you're playing HHM you already know to expect Damien. Still, he hits like a truck, too bad his speed is fucking awful. 3/10
Keep in mind that Linus' version of FFO is a great map for S-Rank runs. The turns requirement is redankajank and you can grind exp hardcore at the arena. Of course, it also requires using Eliwood and Lyn.
A 7/10 seems like an appropriate score to me for Athos, whose usefulness is unwavering. Can be very good in a pinch. I suppose it really depends on how much weight you give to being a "1-Chapter Ace," if you will.
Don't forget, in the Eliwood mode only level with the Berseker, Georg. When a unit finishes an action on a fire tire, and has movement left over, it can perform a console style re-move