So from what I'm gleening, DPS we build our DPS melee characters for comes down to a luck based system.
On occasion, I've not been extremly fond of it on my casters. Ie; max out your crit enhancements, items, etc you have about an 18% increased chance of getting a crit. You may get lucky and land 3 crits every 3 spells cast, or it could be 1 in 30.
I'd like to know on average how much less DPS we're looking at before understanding the effect it may have on everyone else. Are we talking an extra 3-5 mins in raids to beat down a boss?