Critical strike should be a unique assassin mechanic, as it is in every other game. Not a Marksman mechanic. Critical strike is going for the jugular. Backstabbing and exploiting weak points. It's that one in six chance I'll disable my opponent. It's the chance of getting struck by lightning. Right now it's a coin flip for Marksman and for full builds, it's a one sided coin. It should also do more damage when it does rarely proc. It should feel and sound amazing visually.