Honestly I am very conflicted on what to think of Jhin and so is the pro scene
Jhins Strengths
-Super strong laneing
-Has a toolkit to allow him to do fancy out plays
-Super good scaling
-Never feels week because of his passive (basically hes strong even when he has no items for his passive allows him to always do damage on the 4th hit)
Weakness
-Low mobility
-Poor tank stats
-No displacement or reliable instant cc abilities
(fuse these three together and you have a champ who is easy to target and kill)
-A very forced build path for 100 percent crit so you can abuse your passive
Honestly Jhin is this adc who can completely snow ball and take over the game, but if he makes a minor miss play, or if a assasin or someone with lots of burst or hell even some with good dps for example a udyr jumps onto him, hes simply dead. No way to defend himself besides he can ult then snare and hope that is enough to allow him to run away.
Very mixed thoughts on him at the current moment.