How many are grouped together? Is there a banner being used? What's their adaptation? Are they the chief or at least in the chief's party? Are they using the effectiveness of all their skills? I've noticed moral affect my orcs defensed much more than other classes. Prepsprepspreps.

All that aside drink blood bash/grapple repeat and yes they're basically designed to be high offense with low defense but lots of hp to soak up the damage.