So lets say DC hits for like 5k damage. 10% of that is only 500. Divide that by 10s duration, and you're looking at 50 point ticks. Such a powerful DoT, huh? Honestly, I'm not even sure why the DoT component exists on the talent--it's so utterly useless.
UHB is sometimes bugged on target dummies so that it only does one damage per tick.
As for the usefulness, if it said "increases death coil damage by 10%" I'm sure lots of people would think it was great. That's essentially what it does, but because it's a DoT instead of direct damage, people think it sucks.
It's not you, its the target dummy. Go DC a mob somewhere, and watch for ticks, if you don't believe us.
For some reason UHB and the old Necrosis are unable to do overkill damage or something similar to that. They can't do damage that exceeds the max HP of the target.
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