but at low health, sometimes the extra AP spent can be useful if you want to get an enemy down faster.
yes, at special case sometimes it could show some potential.
When you are limited to skill slots, or money for books, there are better skills.
When you have plenty skill slots and money, e.g. Man-at-arms = 5 then fighter's damage is so low compared to other classes, that I would not bother to switch a skill bar to find a rarely used skill who could give me potentialy few hp bonus at the end of round.
Althou the name of the skill is bad-ass, I admit.