Katarina needs nerfs

Her kit will get reworked again. I'm sure it's only a matter of time. I think they should just give her (and everyone else) mana.

In the mean time, reflect upon the fact that she is one of the few champions in the game with no CC at all, and that champions who don't have an ability that can either stop her ult immediately or dash away from it are very rare.

Katarina is a snowball champion, she is vulnerable to CC, she has no CC / utility at all. If you prevent her from snowballing (that means: you do NOT have to kill her in lane - just farm), she will be useless. Period.

She is just good with people who make mistakes. So if you lose against her, that means YOU make a lot of STUPID mistakes.