Irelia is stupid.
I was just thinking of comparing her to other top laners, lets say gp. They both build trinity force, but do you ever see a trinity force into full tank gp one shotting an adc with a barrel or q? Hell no. Not even full ad ( not crit ) gp can one shot an adc. But irelia literally just builds full tank after getting a trinity force and has 0 issues with sticking onto an adc or staying alive throughout the whole fight longer than a maokai would because of her ult sustain. She definitely needs nerfs because her ability to stick and kill just after one item and then be nearly impossible to kill after full build is really dumb.