Crit chance and the Crital Strike
Okay, so a lot of people have been saying that crit chance needs a change. I can't say I'm a fan of the ideal that developed from this though so I did a little theory crafting on my own and this is what I came up with.
Crit chance as a static stacking mechanic. Basically, so long as you have 1% base crit chance, your crit chance goes up by your base crit chance with each auto attack. I calculate base crit chance as being your crit chance given to you by your runes and items.
Until you hit 100% crit chance, you will not crit, but once you hit 100% crit chance, your next auto attack is guaranteed to crit. Your crit chance does not go down until you hit 100% and get your crit off, then it drops back to your base crit chance. Heck you could even give it a similar icon to Statikk Shiv to tell you when you'll get your next crit.
Obviously this idea needs tweaking and streamlining. But I think it would be fairly simple to implement and a very straight forward approach to crit.