I've read the threads containing confirmed bug reports for Seal of Command which makes it seem like the spell doesn't get to live up to its full potential for ret specs with vengeance. Apparently damage shields also gimp SoC's damage.
Then, I read other posts where people suggest abusing the state of the mechanic, as if it actually gets higher dps than it should somehow. How is this the case, and does it make up for the above bugs?