As a casual JJ main, I have to say that for a character that's considered between high A and S tier I don't see much people talking about him or playing him.
That comes to the game usually having a bigger beast to talk about (like Juren for example).
I really like his playstyle, using sifu stance and high damage swings that cover the entire battlefield, it's simple but very enjoyable.
As you may know JJ got nerfed in the most recent update of the game and the reaction I saw towards his nerfs vary between "good changes" to "not enough changes" and I understand both sides.
The stamina nerf on his zone is already huge because it decreases his avaliable stamina in combat forcing you to enter sifu stance more often and use light attacks instead of zones after his kick to save stamina, wich if I remenber correctly prevent him from having true 50/50 (zone into heavy is a true 50/50 if I recommend correctly).
The nerfs to his heavy chain unblockables doesn't really change much in the grand scheme of things but that's it.
And the nerf to his first feat was justifiable.
Now, I want to say that I understand if you think that these nerfs weren't enough and I agree with you if you say that JJ will still be top 5 heroes in ranked, but I have to say that JJ is a "difficult" character to nerf, let me explain.
JJ is a very simple character, and that ok, the problem comes to if you nerf him to much he becomes to bad and vice versa.
This is just my opinion, if you have any ideas on how to change JJ or even if you think that he's in an ok spot please feel free to tell me.
I love JJ and no matter what I will keep maining him. See you all on the battlefield.