Spirits Within: Spirits within is off the gcd. At the very least, it is (usually) a free, 300 potency attack that you can use in between your threat combo. This makes it, before damage modifiers, one of the hardest hitting melee skills in the game. If that were all, it would still be fine, but it is also a silence. Of recent note, this is hugely useful on the Dhorme Chimera, because it means you can do other things besides just auto attack and still interupt.
Hallowed Ground: I don't get your complaints about this at all. This is spell is awsome. It's funny seeing warriors complain about paladins and not mention this ability, because this is the true reason paladins are OP. 10 seconds immunity to damage, and it doesn't even drop threat like it did in WoW? This is the ultimate tanking ability.