Whenever I browse the boards i find people brainstorming on ways to rework critical strikes and i don't know why. A lot of games have crit chance with no problems and i feel like league is one of them
because its "random"
I dont have a problem with it.
well, theres one exception. . .
(insert QQ post)
alright maybe 2.
its random thats why but if u understand math youll realize its not as random as you would think
ya feel meh?
Cause people like to complain
The problem is that it adds far too much variance for not the best reasons.
Let's contextualize this with a good example of variance; which side of the map you're on. Both sides of the map have different geography, buff placements, and epic monster preference. Furthermore, which side of the map you're on is mostly random. Despite being random, nobody "loses" for being on one side or the other. Instead it presents a situation for the player to work out: How do you take advantage of what side you get? Does it affect your early clear pattern, how you prioritize ganks or epic monsters and so on and so forth.
Critical Strike Chance does basically the opposite of everything described above.
Don't Crit? Deal some damage. Crit? Deal a lot of damage. Big difference from before is one player wins and one player loses in this situation. It also doesn't affect decision making in a strategic way for the most part; most champions building Critical Strike chance were going to auto attack anyway. In this effect, Critical Strike chance is just an extra RNG flare onto an already intended action. There's little depth in Critical Strike chance in this matter, and it's mostly a big red flag for bad RNG design.
Evaluate the Critical Strike chance systems of other games and consider what they're there for. What they're really there for. You'll find they're actually well designed forms of RNG (old Role Playing Games), mechanics with purpose (Pokemon's Critical Strike Chance), or actually badly placed (competitive strategy games).
because it transforms those who are supposed to be DPS champs against tanks into a 0 counter-play + 0 CD + 0 resources burst machines against squishies while retaining their DPS which is a problem
Having pseudo RNG is a pretty bad mechanic. Having fights depend on whether someone gets lucky or not is a bit bizarre. Imagine two Caitlyns 1v1ing same runes items etc. Neither move neither draw aggro they both simply clicked on one another at the same time. While both of them have 
only one of them gets a critical strike and thus wins what should've been a dead even fight. While this is the nature of RNG it feels unfair to the one on the unlucky side.
