I can't be bothered to make a list, so I will just use yours and say which I agree and disagree with.
Overall I actually like your list, the only ones I disagree with are Bard, Malphite and Blitz. Bard yes I don't want an idiot that never supports playing him, but in the hands of a support main, he is easily near the levels of Janna on being the best support. He is basically no different than any other support that isn't Soraka. If they don't know what they are doing, they will suck. You can be Morgana and if you never do good shields or land Qs at all, let alone good ones, she will be garbage, you can be Blitz and miss 99% of your hooks, once in a blue moon landing one, you will overall be useless. Hell you can be Janna and you will be hot ass if all you ever do is just her Tornado, they can only do so much, her Ult is vastly more game changing then a tiny knockup her tornado does.
Malphite I might be the devils advocate, but I see him as basically being a predictable wall. He is strong vs ADCs since he was made to be. But all he is is an Ult Bot. If you flash it he basically becomes useless other than a semi ignorable meat shield. Ive seen ADCs completely ignore Malph since they flashed his ult since his follow up damage is ignorable if pure tank and while it hurts if he builds AP too, can easily be LS back
Blitz is basically similar to Malph, dodge his hook and he is nearly worthless for the next 10 seconds. Initiate after his fail hook and you have a good chance of winning if even playing field.
Zed is in my opinion a broken Assassin basically because he has the poke/waveclear of a mage, as a basically resourceless champion. Either lose damage on his shuriken, def lose range, or both and he would be fine. Shaco is basically either you are godly and win the game and end it before 20 minutes, he is hot garbage and is entirely worthless all game and costs the game since its a 4v5 all game, or he does great early but lets the game last too long and becomes ignorable late game often causing a lost. He just isn't worth the hassle of risking. The rest are basically just Rageblade abusers that are basically nothing special unless they have a broken item to abuse. Jax was laughable and nonexistant prior to Rageblade, he will be again once they nerf Rageblade(Which I feel shouldn't lose its stats, but its cost needs to raise a lot, its stats are on par with IE and such, so it should have a 3500-3700 price tag) Quinn is basically terrifying at best, annoying at worst. Quinn is more a top laner or jungle than she will ever be an ADC, due to her mobility she will be terrifying if ahead, but even when behind she still is annoying since she can turn 1v1 into 1v2s.