Kayle is still a horrible pick for anyone other than Dyrus, just like when Genja popularized AD Kennen. Both picks are incredibly stupid unless you have the team comp for it. 99% of games do not.
Blocks damage for 2 seconds, for anyone (ult trondomere for hypertroll)
Slow
Heal
Speed buff
Ability that gives her AOE splash attack with range
She can go any lane (except shitty AD carry)
Can still deal damage as a support
highest level 1 AD of a ranged champion (if not it's near there)
amazing ass late game
>Jelly because you picked the boring sister
unless you jungle her