I thought all playable races have same (or simmilar) description as Half-Orcs: "Half-orcs are not evil by nature, but evil does lurk within them, whether they embrace it or rebel against it."
Meaning basicaly that while there is some standard to expect ... you certainly can be an exception. O_o
I still dont understand why cant we change Race for our hirelings. Lets us play Githyanki as racist as they trully are!