12/13 PBE Update mentions crit will be updated at some point
So scrolling down some Riot mentioned that crit will be getting worked on eventually because the notion of doing everything right and still losing due to RNG is a problem. It won't be for a long time, I think next preseason at the earliest maybe season ten if not later. As an ADC player I would be excited for a crit update because it's a very binary stat, you either get 70+% or you don't get any and you build lethality. It makes marksmen very streamlined save for the few on hit users like Varus or Kog, or those who go lethality which is in itself an issue on marksmen. I'm stoked to hear more in the future.

and 3 auto's in a row, now crit.
who had 20% because of lethaltiy and
hit all 3 of her shots at 20% crit and killed me. At that time I was just like "yeah crit rng needs to get the fuck out and replaced with something better.