Jihn might just be a little broken

I can tell this was only your 3rd Jhin game.

Every good Jhin knows you stop at Quadrakill. :P

He's next to Kog'maw as the most vulnerable to being jumped on ADC if you ask me, and tends to lose straight up duels unless it's someone he can kite.

No escapes. Jhin can only do this if he is basically ignored by the enemy team, comes in at the end of a teamfight where the whole enemy team is low, or his team peels very well for him.

Right now vayne is much more broken imo and can easily turn a lategame teamfight if the enemy team is not too fed.