Hmm. I’m really curious about how Bloodlust and Perception sigils compare to one another. Trying to model them is difficult because of all the variables: weapon damage, skill coefficient, target armor, power, crit chance, and crit damage. Power yields a higher expected value up to a certain critical chance value, I think, after which crit chance is the higher—but that value varies dramatically depending on the above factors.
This is strictly in terms of direct damage; factoring in procs and other benefits from critting wouldn’t just be difficult, it’d be completely infeasible. (How do you weigh the value of swiftness on crit? Or any other non-damage crit-based proc?)
Edit: Ok, well, I made some simplifying assumptions (let weapon damage be the average of weapon damage range, let armor be a fixed value, choose a certain skill coefficient…) and checked the Expected Value of a range of power, crit chance, and +crit damage values.
Except for a few outliers, an extra 12% crit (at level 80 from the 250 precision) hardly ever yields a higher EV than an extra 250 Power. Now, as I said, this isn’t taking on-crit procs into consideration, but considering the internal cooldown of most such procs it’s hard to argue in favor of crit over power.
Crit as a complement to, not a replacement for, Power seems to be the wisest course.
