Remade review, everything gets clearer with more experience:
Coup de Grâce is a funky card and surprisingly, it's pretty good for what ails combat focused characters.
When you do battle with a "Skids" O'Toole or Jenny Barnes or Finn Edwards one thing will probably strike you, routinely making attacks at +6 or better is a challenge and you often need to go even higher to combat harder foes (or harder difficulties) or guarantee overcommitment success from cards like .41 Derringer or Switchblade. All those attacks probably cost money and cards and precious ammo. One annoyance that fighters struggle with uniquely is the "Hard enemy with 1 hp left", do you blow another shot from Chicago Typewriter on it? No gun to finish what you start with Sneak Attack or Backstab? Without proper bonuses you literally stand no chance at killing the bad guy like a might do with just raw .
This is an innate issue that Coup de Grâce fixes. It's a costly fix but a fix still. On one hand the card mechanic can do it, but also the 2 icons might get you there as well.
Coup de Grâce is the card that finishes what you start, it's a niche and the currect class that is queen of niches is of course, .