It's actually pretty damn strong in practice. Casting J and then DH = instantly every mob has J debuff on it.
Should be a huge increase in DPS in M+ or any fights with 3+ targets for a reasonable amount of time. Overall, it's obviously useless ST, but the 2000 str from the previous trait makes up for that.
Anyway, just wanted to pop in and say that yeah, it spreads so fast you can't even tell it's spreading, it just basically looks like your J debuffs every enemy around you.
edit: First thing I did was test if it spread judgment of light. I didn't expect it to, and unfortunately it doesn't, which maybe is good, because I didn't want to be forced to give up auto-bubble.
edit2: Reporting back to say it's bugged. Sometimes it just doesn't work. Been using it while farming portals, and I'll judge a high health elite mob in the middle of a huge pack and start spinning, and the debuff will still only be on two targets. RIP.
It almost seems like the first time you J a target, the debuff will spread instantly to everything around it, but subsequent judges don't seem to replicate ever. Haven't tested in a dungeon yet though, just out on the broken shore.
Seems like it's intermittent like the DS bug was. I tested it in a dungeon and it worked perfectly.