There's a dragoon I play with that has a rather nice crit build, has trippled melded crit hit materia in body, crit in belt and hands from the new materia, the tricorne and these wristlets.

When I parsed our darnus fights he was critting close to 40% of the time. And with all that crit attack power on his gear, he was close to a Gae Bolg dragoon that only crit 20% of the time with a similar number of weaponskills.