Knowledge is half the battle
Experiencing this sort of situation a lot in low Silvers elo.
This seems to be where a lot of the new players get slotted. This is fine, it's okay and I can handle it. What I cannot handle is not knowing that I'm playing with a Lux support that has no runes for her champ. Or not knowing if someone is playing Jinx for the first time. Or a Shen support that doesn't know what a relic shield is or a sightstone either. As a player trying to do ranked you have expectations of the players around you, and it would help some if there was a display available (in-game) that would tell you if your support or ADC (or whatever) is new, so that you can guide them. It would be much better if I could warn the Lux not to run into Nautilus... if only I knew.