Its not 100%
Like many other people in this thread have said, its close to 100%, but not 100%.
Docs usually cost 200k-400k.
Critical damage is only defense piercing. Every critical attack also equals 1.5x your normal melee (based on strength) damage from what I remember.
Most likely wrong though.
The attack speed is very slow and its not worth using outside of pvp where potting is frowned upon.