I don't want to argue with you
If you were even half decent you'd know theres at least half a dozen mid lane hard NOT SOFT... HARD counters to katarina.
There's also alot of champions that simply outrange her so they don't have to even interact with her.
That may or may not be considered a counter... imo Its not its just a farm game.
Passive play doesn't win ranked though so thats probably why you consider your low mmr myself so annoyed by kat because you play passive.
Should probably pick up champions that are aggressive in lane and rewarding successful aggressive play.
I'd look up your mmr but you probably already know that it needs work before you're 2.4k+ where people actually know more than 2 champions in a role and can just outpick half the enemy team.
Also stats mean nothing to me, so don't use them to argue.
I go off actual gameplay I've experienced not some bullshit you can look up ;]
you could be 30% winrate and I wouldn't care because stats mean nothing.
The only thing that matters is that you, as of right now, don't understand how to play against kat and should learn before you ask for nerfs like most casuals who know barely anything about a moba.
There are plenty of websites that offer counter champion picks.
And even explain it to you in great detail.
I'd suggest you go to these websites and read.
Before bitching.