Raw Intuition is 20% Physical DR for 20s every 90 seconds. That sounds a whole lot closer to Rampart and Shadowskin if you ask me.
And a well timed Sheltron does the exact same thing as a well timed Inner Beast. It reduces the damage of an incoming Tank Buster. It's much harder to do, but it's still there to serve the same purpose if it needs to.
My point was that in ARR Paladins had a longer duration, longer cooldown ability (Rampart), and Warriors had a shorter duration, shorter frequency cooldown (Inner Beast). In HWthey gave Paladins a SHORT cooldown (Sheltron) and gave Warriors a LONG cooldown (Raw Intuition). Both are weaker versions of their respective counterparts (Rampart > Raw Intuition and Inner Beast > Sheltron), but they still fill in those niches.
DRKs are missing a single SHORT cooldown. Something to use on frequent tank busters. Beyond that and reprisal issues, we're really quite balanced.