Get your facts straight. 56% winrate? She has a 50% win rate overall. So no, she isn't that strong. Her win rate has been on a downward trend since patch 8.2, her play rate is quite low, and she falls off late game. Saying she is easy to play is a horrible argument as all champs are easy to play. Some are just hard to master. Riven, easy to play, hard to play well. Yasuo, once again, landing a q isn't hard, what you do to do well after that Q determines a good player from a bad one. Katarina isn't as strong as other champs. She is an assasin. She does high burst but is bad in sustained fights. You shouldn't allow her to get to your backline. Save your hard CC for when she ults and she's boned. She requires resets. If she only gets off one rotation of spells, that's not a lot of damage. Stop complaining and get better at the game.