Crit is the best in game for dps and the base crit chance is the most important roll in the game and this got the highest base CC in the game.
Double crit is just icing on the cake.
All the passive nodes and increased crit chance roll on gears scale off the base crit on the weapon.
I'm at 90% cc right now. I can get it to 100% with a few more levels.
I am at 70% with spear glass, 230k dps in town.
With tongue i have 50% less dmg
With