It's a situation ability, it's going to look good when calculating it with ideals. It can also hurt you so much if calculating with the worst case scenarios.

Example: Assuming your popping it regardless of whats coming at you and this scenario lands:
1. Your at full health and pop IB with no infuriate up
2. Your healing was 0 and your stack is lost
3. A big hit comes and you have no bonus healing to you

Your now stuck in a far worse situation then you should be.


I agree with everything you state except for the "At all Times" part. This ability (like most tanking abilities) is still a situation based ability.
Somewhere between the "Spam it off cooldown" and "never use it unless you have infuriate" boundaries is the ideal.