As the title says is Unrelenting Ferocity actually even worse than useless.

My reasoning goes:

First you can only use while raging, hence in combat. Second it only heals a very small amount (1D8 + Con bonus, say 6/7 total) less than you will get hit for on the next attack against you most of the time.
Third, and most seriously - the bit that makes it worse than useless, it takes an ACTION to cast – meaning you FORGO your attack that round.

TLDR: it only heals you for a very small amount and you lose your attack action to cast it, which could have been a lot of damage and have helped to end the fight. Or am I missing something?

Discuss :