Speaking of the future though, Unnatural Strength (x2) is far from first on my list.  Right after Darius gets his "Rogue Marine" Elite Advance (which will cost him 300xp now, as he's already gotten several of the abilities that advance would otherwise give him) he's planning on getting the "Budging Biceps" talent, so he doesn't have to brace his weapon before firing it.  It's a big advantage for a heavy weapon's user... and he's more useful as a portable heavy machinegun platform then as an unnaturally strong melee combatant... at least for now.