Crit needs to not be random anymore.
I hate staying under tower with 200 health left, thinking "oh it's safe to stay here because their ADC only has 120 AD, I can easily survive," then having their bullshit 15% chance proc to kill me with a 240 damage auto. They stupidly dived, something that could have easily been turned into a kill, but their autoattack just RNGed and they got lucky.
We should know exactly when crit is going to happen on our champion. We should be able to plan attacks/dives etc. around that one crit. 200% damage is a big deal. Enemies should know when you'll crit so they can outplay it or know where to back/hide so that they don't get bursted OR so that they can capitalize if the enemy tries to dive.
It's not even that difficult of a thing to implement either. Like just make X% of the autoattacks crit. So 20% = every 5th auto crits. 30%, you have 2 of the first 5 crit and then 1 of the next 5.