Seems legit
Now image 6 people, on a croweded map, and her R.
You have a good amount of items, followed by what I would assume to be as not many items on the enemy team, You executed that poorly as you were not using smartcast (reducing time by a solid second) and none of her abilities scale outrageously, stop complaining about champions that are not that bad
That wasn't even good. That person took waaaay too long to execute that combo and he event waited a second under turret aggro. That whole thing would've taken me about 1.5 seconds to do.
Out of all the reset champs, you choose Kat, who's the easiest one to counter?
How was that in any way Kat? She was just the cleanup crew.