For a character with a crit chance that is.
9luck+Finesse+beret5% bonus+Ninja perk=34% critical base multiply that by the 3x critical multi of the mantis gauntlet and you have a 102% to get a critical hit, every single hit is a critical.

With better criticals the bonus damage is 45. With slayer this amounts all up to a massive 236 DT ignoring DPS. I'll admit the ballistic fist is fun to use, but when i want to take out the legendary deathclaw on very hard/hardcoe, it will be done(In under 4 seconds, literally).

Even if you don't have a base crit it's still something to consider carrying around due to it's DT piercing.

yeah its a great weapon for armored targets.