The Orks plague the galaxy from end to end with their ceaseless warring and strife. They are a race rooted so deeply in war that peace is utterly incomprehensible to them. They cannot be bargained with or bought save with weapons, which they will inevitably turn against those who tried to bribe them.
Ork Warbosses have long been accused of using unsubtle, sledgehammer tactics. These charges are undeniably true, but then again, so is the bloody evidence of their success.