Mace probably changed not long before you came to the forums atleast. Before it was considered sub par to other sets and then Castle buffed it. Now you probably don't hear much about Mace because there is nothing to cry about balance wise.
He will honor his words; he will definitely carry out his actions. What he promises he will fulfill. He does not care about his bodily self, putting his life and death aside to come forward for another's troubled besiegement. He does not boast about his ability, or shamelessly extol his own virtues. - Sima Qian.
You will, however, see WM builds posted pretty often, since it's much more popular than it was pre-buff.
As a matter of fact, one of the Tanker Tuesday teams this week had three Mace tanks on it, including my Dark/Mace. 
PS: My general WM build advice is that you should take everything in Mace except Pulverize or Jawbreaker, but for WP I think I'd suggest taking JB over Pulverize. And definitely take Clobber and Crowd Control as soon as they're available.
My Characters
Knight Court--A CoH Story Complete 2/3/2012
The names of mace's powers make me smile.
Haven't seen much about mace as a secondary. Any good? Got an old WP/Mace tank from when I first started playing. Decided to dust him off. Pooh the Bear. If you've got a build, or anything to say at all really, feel free.