Warforged are an unstoppable race. They wade into battle and keep fighting long past the normal limits of other their flesh and blood companions. Their durability bolstered by their racial power, lets them call on their deepest reserves to heal damage, gain temporary hit points and make saves to shrug off ongoing damage. Few other races are as all around tough as Warforged.
Warforged Resolve is a great racial power because it allows your PC to gain temporary hit points as a minor action. If you wait to use the power when you’re bloodied it also provides a way to get healing without expending a healing surge. The fact that it scales as your level increases. makes this power even more versatile. This alone may at first make Warforged Resolve seem like a poor cousin to Dwarven Resilience (which lets you use your second wind as a minor action and thereby spend a healing surge to regain a lot of hit points), but thre’s more. On top of the real and temporary hit points, you get to make a save against ongoing damage when you use Warforged Resolve.