How to fix crit for ADCs
Right now, critical strikes seem to be a major issue, some people want to keep it and other people want it gone. Since critical strikes are so important in two champion's kits, IE Yasuo and Jhin, it's unlikely Riot is gonna flat out remove critical strikes. However, I think there is a solution.
The reason ADC's build crit is to increase their DPS, not their burst damage. However, when melee champions build crit, it's for burst value, so the simple answer is, give ADC's the Yasuo treatment. As in, ranged champions only get a 150% critical instead of the 200% crit, but unlike Yasuo they don't get the double critical bonus as since they are ranged they have safety that Yasuo doesn't have.
By doing this, champions like Gangplank who use their critical for burst damage aren't impacted, but champions like Tristana and Twitch who at current are doing ludicrous amounts of damage that has almost assassin levels of burst with their criticals will no longer be able to burst down entire teams.