Originally Posted by
Llarold
Haste is the best damage reduction stat available until around 30%, at which point it makes way for Mastery. Versatility interacts positively with both Haste and Mastery, but is actually less than half as potent as Mastery when wearing equal values.
If you'd like some napkin math to feel more comfortable, consider this:
1k Vers adds 2.5% healing and 1.25% damage reduction.
1k Mastery adds 4.38% AP.
AP directly contributes to healing at a 1:1 ratio, and 4.38 > 3.75 by a ton. This does not factor in Critical Block at all, and it is by far the bigger contributor to damage reduction, providing 10-15 times more damage reduction from autoattacks than Versatility.
As such, you should aim for roughly 30% Haste while picking up mostly Mastery on the side. If you can manage to get about half as much Versatility as you have Mastery, that's great. Crit is a pretty low-weight stat across the board, and should not be a priority.
Icy-Veins and AskMrRobot are both out of date, and were never accurate.
If you're curious, I am the Wowhead Class Guide Writer for Protection Warrior, Blood Death Knight, and the worldwide #1 Brewmaster All-Star (fwtw, lol). The Wowhead guide is up-to-date, and these weights are accurate and based off of extensive SimCraft, log analysis, and ingame testing.