Your lack of knowledge about the game really says a lot for your level of skill at league...
Garen, pre-rework, didn't have the Villain mechanic and was considered trash in Ranked for his lack of teamfight potential. It actually took quite a bit of skill to play him as the easiest and strongest counter to him was kiting, something everyone should be able to do. Despite this and my teammates lack of faith in me, like i mentioned before he was considered trash, i almost always ended up carrying every game.
Morde couldn't 1 shot anything, not since DFG was removed, also considered trash although thats because no knew how to use him. He was very strong but definitely not 1 shot and definitely not tanky. Another champion who required some amount of skill to be effective as he was easily kited and poked without being able to trade back. He was also the only champion that used health as a resource that didn't have some way of gaining it back.
When a champion is simple, so is the solution to dealing with them. So there is a required amount of skill to successfully use said champion against higher skilled opponents.
So just to reiterate, before the reworks, those were 2 of my mains along with Malzahar and Nami. After the rework they were both perma-banned or first pick, so i never got to play them which is why i was upset, not because they were nerfed... which doesn't make sense at all, Morde was op for a while and Garen was definitely stronger overall... So thank you for insulting me for no reason, acting as if you know what you are talking about when you clearly don't.
Also people who bring skill into an argument that has nothing to do with skill are normally either Bronze or Unranked... Shall we find out if thats true or not?