Is the Seraph Soldier variant of Valentine good? (tips from skullgirls0_O)

While Valentine is alive, the active Fighter gains ENRAGE for 10 seconds when dealing at least 10%of the opponent's MAX HEALTH from a single HIT. Also, your active Fire Element Fighter permanently increases DAMAGE by 0.25/0.35/0.5% every second.(Signature Ability 1)

While Valentine is alive, 15/20/25% of all damage inflicted by the active Fighter's CRITICAL HITS is regained as HEALTH while that Fighter is benefiting from ENRAGE.(Signature Ability )