Perhaps it is time to rework the crit?

By the end of the year we will have new rune and mastery system, I was thinking, maybe we could use that to change the way crit works? Currently critical strike is a really frustrating mechanic to both use, and play against, due to the rng factor, this isin't hearstone. I had moments where I would get crit 3 times in a row by a guy that had 30% crit, and I have seen people lose the duels, because they wouldn,'t get any crits out of like 5 autos.

I have a simple suggestion to rework the crit, but essentially do similar job — make the critical % amp your aa damage by that amount. For example you purchase phantom dancer, now your auto attacks do 30% increased damage, you then buy statik shiv, 60% bonus and so on. This would remove the rng part that nobody likes, and make crit a lot more consistent, in a sense that you would know exacly how much damage you are buying. Thoughts?