Under Utilized Stat - Critical Damage

Riot, you have this awesome stat that can be used to differentiate build paths and create a ton of new exciting items and yet it has gone almost completely ignored!

Why not reduce natural Critical Damage from 100% increase damage to 25% increase damage, Make Critical Chance Items slightly more common, cheaper, and providing more Critical Chance and then Also Introduce a series of potentially strong Critical Damage Items

This would have a great impact on reducing lucky low% Criticals in low levels that can completely change a fight while also implementing a new, interesting and exciting build option for many characters!