If you're trashing him every game, then does his pick/ban status make him OP?
The guy just got released, and there's many threads about people just banning him just because it's the first week, and people just wanting to pick him to try him out (like this thread). If you're trashing him, then you don't even have anecdotal reference for it :/
From what I remember, ban rate is more about perceived power (Darius's ban rate did not lower for awhile after some, er, very reasonable nerfs that toned down his power quite a bit. People do not forgive and forget that easily) which is likely to affect a champion on their first week. Considering how Jihn scales uniquely with his AD, people might call him OP right out of the gate. As for pick rate, people want to play the champion that just got released. It happened with Ekko, Tentacle Princess, and a few others.
Honestly, I think it'd be better to at least wait a week or two to see how people adapt with and against him. This playerbase can be finicky sometimes (I know I am). If he is truly OP, we'll see a similar pattern to the Graves rework. Bursty ADC's can be a sore spot in the balance discussion department, so while I'm not going to say he isn't OP, I'm just not quite sure if I can trust anyone saying he is.
Although if he truly is OP and you're still trashing him, nice. Kick him down before he gets nerfed for bragging rights.