haha, if you are playing an assassin against kindred. you go all in. attempt to assasinate, then wait about 2 seconds, then drop ignite on her and run away.
then you laugh because like with tryndamere, she will die from the ignite ticks. the ignite also applies grievous wounds and halves the heal she gets at the end.
as a tank, you should never let yourself get kited against an adc and kindred has a lot of tools to kite you with Q and a slow. unless you have supreme lockdown (think malphite w/ult, maokai, etc.) you are going to never catch any adc that has mobility like hers. You wouldn't chase a vayne mindlessly, dont chase a kindred mindlessly.
her damage is definitely overtuned right now and I think she will eventually be nerfed, although not in the near future. to say she is impossible to beat though is rather ridiculous. her kit is fine. her damage is a bit strong, but so is any adc late game. which is what she is.