The OP is right.
I don't think it is the ADC metta so much as the ELO HELL that is Silver.
If you constantly out perform your opponent and win your matchup, but derank, it is very frustrating.
Yes, you can try some hyper-carry strategy with a broken champ to try and carry teammates that are liabilities, but the frustration is players shouldn't have to. The matchmaking should not stick you with players that are so absurdly out-classed. Statistically, if I start 70% of my games 3-0 with the first turret, I should expect to win and rank up (in a well-made ranking system). Yet the exact opposite is the case. The liabilities you get assigned to your team in Silver... it just leaves you scratching your head why they are even in ranked.
Its as if Riot is telling me: "Not only do you need to spank someone ranked higher than you 1v1, and be the sole focus of the enemy jungler, and gank bottom to help them hold lane.... but you ALSO need to serve as a coach, teacher, therapist, and baby sitter for your team of raging toxic liabilities. And EVEN THEN, you are still going to derank"
Also, Don't voice your frustration in the game's chat or we will ban you. Thanks! - Riot
¯_(ツ)_/¯