What have we learned? My Kung-fu is better than your Kung-fu.
~ Felix Faust taunting Zatanna in Justice League Action.
True martial artists focus on knowledge, defense, emotion, and many other passive feelings, but some individuals use them for offense only. Villainous Martial Artists often lack the sense of honor that their heroic counterparts possess since they reject the honor that it teaches and instead focus solely on attack only, though this isn't always the case.
Martial artists are an advanced form of Fighters and are extremely formidable and redoubtable in combat. To qualify, a villain must demonstrate agility, timing, speed, accuracy, and good counter-moves, not just strong punches and kicks.