So mystic, striker too I think now get +20% crit rate from their passive.

I can crit with the matchlock with no buffs. When I get +5 crit, I don't feel much of a difference.

So how is it being calculated, or is it bugged and the +5 is canceling out the passive? What the artifact lightstone effect for +8% crit rate even make a difference?

I honestly would not make a hunting class based solely on their crit passive. The only reason people are making Striker hunters is because the clear speed with Rhinos and Shadow lions is a bit better with right set up ( average of 5-6 hits on crits to kill versus 7-8 without passive). If you teally want to min-max hunting rhinos and shadow lions, get a Shai in your hunting group and watch your XP pour in.