Defense is actually useful for any race, but if you're not playing with levels 30+, it might simply not fit. The primary goal of an Orc is to defeat the enemy as quickly as possible (especially if it's a mage; this refers directly to the battle, not to prolonging or shortening the game). To achieve this, you need attack with tactics and retaliation, leadership if possible to increase the number of turns for Orcish troops, as well as a speed aura (no comment needed) and, if possible, Battle Fury, as it's a useful skill. Logistics doesn't really need any further explanation. Luck enhances physical damage, and it's useful for Orcs more than anyone else. For a short game, choose units with offensive skills and some of the above (you can't take everything at once). If Education becomes available, take it purely for the extra stats (in general, it's optional, but for me, it's a must-have). Defense just doesn't fit in. And you might also want to take Silence (although I would refuse in any case). No, I'm not denying the usefulness of defense, but there are much more useful skills specifically for Orcs. IMHO.