"The new changes nerfed kayle so hard we demand compensation buffs"
No they didn't. The power level on Guinsoo's Rageblade between stacks 1-7 and the 8th stack is deceptively enormous. Gunblade now heals on **all ** damage dealt including Kayle's E splash damage. She has an ultimate that synergizes beautifully with the ramp up timing of all the new items/changes, as well as Fervor of Battle to supplement the attack speed and AD scaling (from which she benefits but never itemizes for).
Mercury Treads are cheaper (hard cc is her main counter-play) and turrets now take damage from basic attacks based on the higher AP or AD. While everyone is raving about Jax/Yi/Yasuo I'm playing this Diamond in the Rough. Obviously You would want a front-line to play behind but with marksmen so powerful right now a target-able invincibility is pretty handy for them to 1v5 the enemy team while you 

Maybe even a situational new
I'm having fun experimenting. Games are so fast I usually just get to 2-3 items but It's so fun especially with the new masteries Fervor of Battle. I'm sure there is a mathematical way to determine the highest average amount of early DPS for Kayle. It's a shame there is no longer a mid or late-game anymore more often than not.
Tell me what your thoughts are on 
would their passive damages stack?