A good GNB will use their CD's properly and that will make them easy to heal from my experience. Not WAR/DRK easy, but easy enough. If I am being honest though, about 50% of my rough runs through expert have been with GNB tanks. I can't place why, as I do not play the class but during these runs they seem to take astronomical amounts of damage in comparison to the other 3 tanks. Then I'll find another GNB and it will be just fine.