The double attacks certainly takes me back to the days of the Eye of Terror Codex with the 13th Company. Mark of the Wulfen gave all characters (including squad leaders) +D3 attacks. Coupled with Lightning claws or a Powerfist, they took out just about anything.

An army of Wulfen will probably be equally as silly as the original 13th Company (which were fun, but silly). I routinely reached close combat with less than a dozen models (and with only a squad of Long Fangs for supporting fire), and would table opponents easily. Different game back then, but, if I'm reading the rules right, it's possible to get 10 TH attacks of 14 Frostclaw attacks (leader) on the charge... from one model. Maybe not effective, but will certainly be entertaining if even a few models make it across the table.