I've been leveling my death knight, and I noticed Rune Strike is useable after one of your attacks is dodged or parried. Ok, great, the less expertise one has, the more threat and damage they get from Rune Strike.
The issue I see, is that Rune Strike appears to be like Revenge is for warriors. Good damage and lots of threat, for a low cost. The difference, is that Revenge procs more often as your avoidance/block go up, while Rune Strike would light up less as the player got more expertise. Now, I may be wrong as I am not 100% sure on what the soft cap means, but I imagine that effectively having, say, 12% reduced chance to be dodged or parried would pretty much eliminate Rune Strike procs. Now, most tanks won't hit this high, early at least, but at one point it will be met, eliminately much of its major use in a tanking rotation.
Any discussion or reasoning why Rune Strike will always be available is appreciated.
Without looking into the mechanics of Rune Strike I would say this sounds very much like an improved version of overpower rather than revenge. It also sounds more like a DPS move rather than a tanking one.
If it is like a warriors overpower, then generally the applications of this ability is going to be pretty limited to pwning rogue's
Even with a 3.4+ speed weapon you can find yourself without the RP for Rune Strike on occasion, depending on the mechanics of the encounter, your spec and your ability usage. This is fine though, as having to make decisions on the fly is part of what makes tanking fun (or any class for that matter). Unfortunately Blessing of Sanctuary takes that decision making process completely out of the equation which makes it rather overpowered, but that's old news.