people sure like to cry about katarina
but sure don't like to figure out how to beat her.
no. the way to beat an assassin 100% of the time is NOT to pick another assassin that supposedly "counters" them.
people laugh at me when i say darius beats kat. but he does. hard. at level 1, one max range q takes out 1/3 of her hp. at level 3 the second she shunpo's you can grab her, aa,w,q, ignite her for first blood. at level 6 you save your e for when she ults, pull her, interrupt her ult, then aa w q aa r and she's dead again.
when will people learn that almost any champion can go anywhere depending on the matchup?
hell, i've taken darius mid for every melee assassin i've seen, and it always ends with me being extremely fed and farmed.
also, just because LolCounter doesn't list someone as a counter to another champion doesn't mean they're not.
just read people's abilities, and figure out what their strengths are for your own. because last i check lolcounter says nothing about darius vs kat. but i know for a fact that every time i play against a kat, now matter how good she is, or how fed she gets, i can and will shut her down because my kit counters hers.