Q u o t e: Passive Oskills will work with merc, and Critical Strike falls under that category.
Skills that actively require the merc to use them, such as the Berserk and Zeal on Passion weapons, are not used because the merc simply can't use that skill.
Do you perhaps have a link to an article/webpage/whatever, which provides some info as to whether the +x to CS on Insight does make a difference for the 'real-game' damage an Act 2 Merc wielding an Insight?
The effect of the Double Damage should be visible, one way or another?
What are other passive skills which are proven to work on Act 2 mercs?
tradelist: none at the moment...
I can only read, not post, on weekdays during daytime.