Yup. I get crit for ~80 about once a minute tanking mobs 6-8 levels above me. My focus is where it should be, on VIT and DEF. -3 evasion or block or parry isn't going to kill me (provided they drop at the rate of 2 stat to 1 point of evasion, block, or parry, which is unproven but I choose to believe), and since all three of those stats are also based on an associated skill, by taking -3 to all of them, I effectively take on the evasion, parrying, and shield of me, one level ago. Well worth it for the 3 vit I get from a turtle shield, or the 4 I get from a Turtle Shield +1.
I've got a total of +36 VIT when all things are said and done. I'm not worried about a crit here and there.
EDIT: It's not THAT big a deal, it's there but I deal with it. I haven't heard any complaints about taking too much damage.