GNB is about just as easy to heal as the others; main combo offers the same survivability as WAR and DRK, and defensive CDs across all tanks are more or less the same.

Just don't use Superbolide as a panic button, because it's easy to make your healers waste precious CDs. If you want to use it, make sure your healer(s) is/are aware so nobody wastes their CDs.

As long as you don't panic superbolide, you can tank as GNB without worries c: