Anything else feels that CS stat is useless unless you have crafter AND use certain weapons.
100 CS (10 lvls of CS) do not give reliable crits, you see like 10-20% chance on usual mobs you fight.
You have to get 125 CS to see actual benefit, this means you need craft for +25 CS (1st) and 2nd use weapons that benefit from such craft (you cant put CS on bows or crossbows for example).
And in more effect of crits, lets say its not that spectacular. Omg, -1 perception to enemy, or 4 bleed tick. Keep in mind fast attacks give -15% chance to crit so you need high accuraccy (read add to Perception which asks for question if you raise Per and Dex and Str, how many points you put in Con, Cha and Int? And you need Int - unless you go full group and "level" Hieron - to raise CS skill).
I played several times, mostly solo and never did i felt "If only i had higher CS skill this fight would go easier". Though for dagger user its probably a must the way special works.