"this champion is definitely OP! I got a pentakill with them on my first try"
First timing a champion at a low elo is not impressive or an indicator to how strong a champion is. I always see people try to claim their opinions on a champion as fact when they try them out at their own elo, which is usually silver/bronze.
"No way is master yi hard, I got a penta kill with him in me brunze fifth game"- bronze scrub
"no way is draven hard, I just got a penta kill in me silva fourth game"- silver scrub