Kayle discussion... Also, who else is this broken right now?

I've been getting into Kayle ever since watching worlds, and she seems unnecessarily strong. I get that her lvl 1-5 suck, but it's not too hard to survive until then. Then her lvl 6, 11, and finally 16 power spikes make her brain dead to play.
Do you think she deserves a nerf?
Also, what keystone/runes do you take? I have tried Klepto, Lethal Tempo, and Phase Rush.
Finally, what build would you do? I currently build the following always...
Then, depending on the enemy team...

Thanks for your thoughts and comments! [katarina-love]
) and a speed up. Riot should try to encourage more E max and less Q max.
,
, or
very well.