Obviously you're the one who faced unexperienced enemies and especially the "First Game" dont make me laugh try playing her at least 20-50 times in high. You only get away with her kit most of the time cause you face inexperienced who dont even know the basics of positioning
Q- just dodge, W- avoid the tentacles, E- dodge if you get hit you can just fight her to make it dissapear or walk out of range and kill 3 tentacles if you dont feel confident, and R- walk away and wait for it to end
While if you really get practice in, just buy executioner blade to render her useless, and well-timed CC mid W/R makes them both go on full CD and do nothing. Please stop trying to make her sound like some god when she's the worst champ in game atm in terms of usefulness.
no reliable CC, short ranged gap closer, no mobility, not even a speed modifier, not an engager or frontliner in the least, sure she has damage but it's meaningless if experienced players just walk away if CC you before you can get off ulti in the first place.
Oh her one redeeming quality is she's still new so some beginners havn't adjusted to her yet.
TL;DR Win rates of Plat+ where people aren't dumb do matter fyi, since they know to actually outplay instead of just playing braindead like the people you apparently faced.