I haven't been able to access my PC yet to play, so all I know is what I've seen from streams and spectating. I don't know, I was apprehensive from the start about his playability, but excited about the concept. I was just concerned about how a champion with relatively basic abilities would fare when the last half dozen or more champions have been super crazy and/or revolutionary in gameplay.
I'm in the same boat - so far, what I've seen in game has not impressed me. I see people saying "oh he's better in mid to late game!" but the thing is, with a champion put together like Jhin is, you need to be able to survive and thrive in early game in order to have that mid to late game potential. Maybe some better players will find the light in the darkness, but right now I think he might just slip into the shadows until either the next champion comes around or he gets buffed.
I do like that one ability that bounces damage off targets - I think it's cool. c: