My feeling is that he's insanely strong late game.
As an ADC main, I have no problems with him in lane. He's really easy to bully. I often can stomp him in lane, at least zoning him and getting a large CS lead. Unfortunately that opens me to jungle pressure and stops my jungler from bothering to come help (which is one of his weaknesses, so maybe not the best strategy against him).
Regardless, he's weak early and I typically get an early lead. Playing Jinx, a hypercarry of all else.
What tends to happen for most Jhin's though, is they inevitably get a few kills in teamfights and suddenly start doing insane amount of damage come mid-late game (if he gets that far). Late game teamfights against Jhin seem to go very badly for me. They force Baron and his traps just litter the area and suddenly even though you're positioned well you step on one and you're dead. Late game comes down to Jhin attacking from huge range while the enemy ADC prays to not hit a trap. He seems incredibly hard to kill late game, and does insane burst damage.
I'd like to see the late game toned down a bit, compensated with a better early game if necessary.