Earlier today my friend asked me why pretty much all specs he could find included Annihilation. Literaly every build that seems to hover around EJ that does not include Scourge Strike seems to have it. Even the Cookie cutter Blood tanking build. While I was trying to defend Obliterate, I figured that I simply couldn't. The thing is that Obliterate does exactly the same thing as Death Strike, with the exception that Death Strike seems to deal more damage and even gives a bit of self-healing.
Can somebody elaborate and enlighten me as to why Obliterate is better then Deadly Strike, even in a tanking build? If it were up to me I wouldn't put all those points in frost just to get OB's damage on par with DS's, and something like this or even this seems a lot more logical for a tanking spec.