I think you bring up a valid concern and I don't actually think these ppl understand what you are saying although 1 person said something like "Even a Bronze/Silver would seem like Faker to you" and that's probably the most accurate thing I've read.
You have a very real and valid concern, starting off in this game is actually really tough because it's been around so long that most ppl have played for quite some time and even though there are a lot of kids who are really starting to get into league now that is a small % of the player population and most of the players that play even if they are Bronze or Silver are going to be flat out a lot better than a brand new player.
When I was a new player there were games that I lost to BOTS, I remember losing like 1 out of every 5 and thought the Annie Bot was over tuned back then lol cause it seemed to just pop off in all my games when I was new, I'll never forget that. I swear I thought Annie was the best champ in the game back then.
Anyway as long as this game as been around, the Tutorials have stayed pretty uninformitive and there really isn't a great way to learn fundamentals in this game outside of just playing and getting smashed and also getting flamed.
Even the players that are New probably aren't, they are more than likely just making a alt or smurf OR they may even be a BOT just leveling a account to be sold.
The process for a new player to learn this game isn't easy and I think this is something Riot really missed out on. Now maybe Riot knows that the only new players are actually kids or something and they will play with their friends who are already playing league and the friends will help coach the person up. This is actually something pretty common and I still run into those accounts here and there but that still doesn't address the issue
Riot should've had a more informative way of describing the actual gameplay and certain requirements of the roles at least during lane phase and maybe a little afterwards.
There are some things that they can do for sure when it comes to actually preparing players BUT here's the other part, when it comes to champions and actually playing them, the only way to get better is to actually play them and I will say riot has done a really good job with giving players ways to practice a champ (i've advocated this before in other topics) since you don't actually have to queue into a Norm or Ranked game if you want to practice, you can very easily start up a practice game and just spend time working on last hitting, playing against a bot, working on how to combo the abilities, these are all things you can do to better prepare yourself going into the game with actual players.
I would recommend really doing that for a bit before norms, that way you can already have a good idea of how to play the champ and especially if you were playing against a bot (especially one of the harder bots) when you can beat those bots consistently then you are prolly ready to actually play against some of the players and begin learning the difference. As a new player you still have a certain responsibility to actually learn the champion and if you aren't feeling comfortable in norms because of smurfs or because of flame you can always practice in a setting you CONTROL which is practice mode where you can also add a BOT or Training Dummy.