He has outfought, outsmarted and outmatched Deathstroke in a fight in Deathstroke #5 and now he's been defeated against Kraven? Really?
There's very important context you're completely disregarding. Deathstroke comments he's "fighting like an amateur" because of how I-Ching altered him. "I'm slower. Weaker. It's taking me longer to process my thoughts." He commented having two eyes was throwing him off as well. If you think Batman wins, that's fine. But him giving a weakened Slade a good fight -- one where Harley Quinn helps him, too -- isn't exactly the best example around.