Jhin feels, well to be honest, quite underwhelming
I've tried a few game on Jhin, and he feels a bit clunky to say the least. His bullet passive is nice but just a remix of Graves' most of his kit, save for his ult, feel quite unoriginal. His traps are a fusion of Caitlyn's traps and Teemo's shrooms. Without a good amount of practice, his W is quite easy to miss. I will say that his Q going in to mid and late game is fantastic. He's quite useless in the face of team comps that can easily dive/or attack the backline in team fights.
In essence what I'm trying to say with all of this is that some of the new champions and reworks are showing that Riot is either scared or confused. You had the juggernauts and Fiora get changed, yet only Skarner was really nerfed and Fiora was left alone. Reksai was continously nerfed into the ground, and Gangplank is about to be Goneplank with the incoming nerfs next patch. Kindred with their nerfs to their are honestly just OK to me. Jhin just feels extremely helpless and easy to victimize because of how clunky he feels, and I feel thats a result Riot not allowing themselves to design champions without fear of vitriol.