Originally Posted by
boseguy22
I think people read this gem wrong too frequently. It is not 3% crit, it is 3% extra damage when you crit. With the changes in ratings in cata, most people are raiding fully buffed between 25-35% crit, before talents, glyphs.
To do the math, you have too look at how frequently you crit, Add 3% damage to only those attacks and then compare how strength impacts the damage you do, as it applies to almost every DK attack including crits. Someone smarter than me can do the math, but more damage to every attack is likely to outweigh the benefit to 3% damage when you crit until some very high gear/crit levels (and hopefully by then the gem will be fixed).