Mazra wrote:
Since I have 2500 attack power (I'm guessing his chart is feral attack power, not attack power in caster form) and roughly 30% crit, I'm better off gemming agility than strength?
Yes, that is the claim.
Mazra wrote:
I'd also need something like 60% crit chance to make strength just as useful as agility, right?
Ya, like that'll happen.
I'm not saying that it's possible, but rather that it's a guideline for use in gemming and comparing future gear. You should value +8 Agi gems more than +8 Str gems, as they will increase your sustained DPS. You don't always get to choose how the itemization points are spent on a piece of gear, but you can better plan what upgrades you want to get.
It's not really clear to me if there is any correlation regarding how much more you should value agility over strength and how far away from the balance line you are. He just advises that if you are above the line 1 Agi > 1 Str. I'm not sure if as you get farther away if 1 Agi > 1.2 Str, or what (for example).
Remember that it's just a guideline. You'll still be increasing your DPS if you increase your AP while maintaining your crit rate. It may just not be as much as if you maintained your current AP while increasing your crit rate.