For me it would have to be his heart, after he quit in the first Ruiz fight speaks volumes about his willingness to continue. I used to think his boxing ability was his weakness but he has adopted a style that works, not masterful but much better than his boxing ability prior to AJ Ruiz 2.
Probably his Heart and chin. His biggest strength is having Eddy Hearn pricing him out fights with Fury and Wilder
He suffers from ***** made syndrome. Causes are being bigger than everyone his whole life and growing up around other soft mother****ers that didnt have the balls to test him
He is still open to the counter left hook as he still keeps his right hand low, particularly when throwing the left. Considering it was almost his undoing against Whyte, I'm shocked it is still something that has not been addressed.
He stands straight up, he’s sucker for counter hooks, drops his right hand while throwing a jab as mentioned above and for a guy with his strength, struggles in the clinches. And if he’s really to become Anthony “Klitschko” Joshua, he should develope a check left hook. I don’t think his chin and heart are that bad.
His coockiness. If he gets caught with a punch, instead of switching to damage control and avoiding more punches, he sometimes decides to stand his ground and start throwing big hooks. It works at times, but its very dangerous and stupid. And most of all: Very unnecessary.
Like several others have said it's his recovery ability. But now that he's dropped all the useless steroid muscle that might see some improvement.
He can't fight. He can box, very well at that. I think he has heart as he got up from Klitschko. Just because he is strong and skilled, doesn't mean he can fight well let alone wants to.
I don't think it's fair to judge a fighter's entire career on one off night, which is what people seem to be doing. Boxing fans are so fickle, it's no wonder the lengths fighters will go to protect their 0. For all his flaws, at least Joshua has consistently fought genuine top 10 opposition, unlike Wilder and Fury.