This post may be pretty frank, and it's partially opinion, but tired of seeing "Parry gib" on so many forums as fearful thing.
Short version:
Reckoning parry-gibs are mostly bullshit.
Long version, half a year back or something we counted the "incoming damage difference" between Last Laugh and Broken Promise, caused from the weapon speed difference.
iirc, we were talking something around 1% more attacks against us. And that 2,6sec vs. 1,6 sec difference on parriable attacks is same as having allmost 40% haste.
Sure, auriaya might have had some attack hasted to instant.
That's with having 6 people melee her from front with faster swing speeds than you, and with many many more parriable special attacks each than you'll do. Which means while you might have died to it, your own contribution to that is miniscule.
If you want to check out personal danger, just put:
Reckoning up time (there's was a graph somewhere around here for reckoning uptime with different points amounts in it and different amoun of attackers), Your chance to be parried (15%-expertise effect?), and the increased speed/parry (20% on avg).
and compare that to your current situation (the chance to be parried, with the speed/parry.).
I even dug the graph thread, it's this one:
viewtopic.php?f=6&t=5124now, examples:
if i now had 10% chance to be parried and every parry makes 0,2 strike to me (makes the strike 20% faster), that means because of parries i take 2% increased amount of attacks.
even if i had 100% uptime on reckoning, it'd double that so it'd be 4%.
In 1 boss situation, we're talking reckoning giving us much less than 50% haste, so sub-1% increased attacks (of which you'll even avoid your usual avoidance amount, so what 60% or so? Wee, reckoning increases damage taken by less than 0,1%/point?). You will have many times that in variance just from your avoidance.
Back on topic, i'll atleast first skip reckoning (plan on grabbing DG or keep my current imp. HoJ, the taunt cd reductions on sets makes me feel that there'll plenty of adds around in next tier raids, and adds are usually stunnable) while going to crusade again with vindication. If i feel i need more threat, i might move those utility points to reckoning. I think reckoning might be one of the contenders for those few random points before we get to 6th tier in prot in 3.2.