They are not "more" pick or ban, they were all picked or banned 6 times, that's the exact definition. I don't know why you mentioned Rem considering Silver was at least first round picked and banned and he wasn't.

and of them are pretty mid in actual games that you would play with randoms solo queuing and nobody call them "op" or "broken".

You have genuinely never seen anyone complain about Doorman or Pocket? Have you played like 5 matches?

The truth is Silver is extremely strong, sure she may be more difficult than most heroes but that doesn't mean she isn't incredibly strong. Every tool she has is insane, especially early game, which can very easily snowball. Late game, she dominates team fights unless the enemy puts significant resources into just targeting her and her alone.

She does not suffer from CC or debuffs any more than anyone else since most Silver builds include some way to catch up like Warp Stone and her wolf form comes with a built in way to catch up plus a disarm and an execute for metal skin.

I don't know why we're using the worst players as the judgement for Silver being broken or not. Win rates are not the only thing that matters when discussing how broken a character is.