Crit was nerfed, you need insane amounts to get anything from it, even if you go full crit you can't get even close.
Blm gears Ss > Dh > Det > Crit
Effectively you meld mainly Ss and Dh, one slot you can put up det.
At least it was this way at the start of 4.0, please correct me if they changed it since then and made crit useful again.