User blog comment:Qwertyfatcat/A different look on Crit/@comment-6746500-20140210005258/@comment-1330314-20140210021352

League and Dota are two very different games. Dota has 7 second global silences, mana burning and a champion with no basic abilities but 10 different ultimates. In there, you're sort of expected to deal with overwhelming power without having too much of a say in it, and part of the fun comes in inflicting the same power on your enemies. LoL is about outplaying your opponent through mechanics and strategy. Crit chance relies on neither, and thus doesn't fit that well into the game.

The point here isn't about having 100% crit chance, it's that crit chance is fundamentally unbalanced: having a certain amount of gold's worth of crit is either far less or far more valuable than the same amount of gold's worth in another stat, except that this difference is impossible to determine. If you're perfectly neck-and-neck with another champion, and you invest in crit while they invest the same amount of gold in another stat, then you could have two completely different outcomes: either you don't proc a crit in a fight and you lose, getting them ahead, or you proc a crit, getting far more value out of your crit chance than you should, and win the fight and get yourself ahead. This, in the end, boils down to luck and not player skill, which is the opposite of what LoL's about.