WAR kinda lacks the "on-demand" mitigation that have DRK and PLD.

DRK can use The Blackest Night (20% max HP shield) for basically free (2400 has about the same value as 50 blood, damage wise).
PLD can use Sheltron for each big hit (20-28% damage reduction).
WAR has Inner Beast, which require them to switch to Defiance (which is a damage loss in itself) and spend gauge on not-Fell-Cleave (or Decimate / Steel Cyclone on a mob pack).

If they have fewer CD's than WAR, they can pair either TBN or Sheltron with a Rampart or something.