I don't really see fracture as worth it. It's a pure threat loss in any rotation. Just because it ticks when you arent attacking something doesnt mean it's better than just hitting them with a hard single attack.

It's purely a dps boost, and it's a very minimal one at that - 220 potency provided it lasts the full 18 second duration. It's certainly not bad to use it, but unless you're fighting multiple mobs and spamming it across them all at once, you'll barely notice the difference over your regular blade combos.

I don't see Fracture worth taking over the (admittedly just as situational) utility of other cross class options, though.