Most comic master martial artists can't casually karate chop foot-thick steel doors in half:
Mandarin isn't a character who has a handful of feats of knocking the wind out of Aquaman, Grundy and Wonder Woman. He's fought Iron Man with his martial arts pretty much every single time... maybe in all but 1-2 of their fights. He's kicked the sh1t out of Iron Man straight up with his fists, parried and blocked same, and even broken his arms with martial arts holds:
When Batman regularly engages a foe like Iron Man from the 60s, 70s, 80, 90s, 00s, all the way through to modern times with H2H combat, and essentially dominates that foe nearly every single time with it, then a comparison can be made.
Mandarin was Temugin before there was a Temugin and he completely outclasses Batman.