As for 3PO, I agree that he was treated like crap, and his lines were the most vile pieces of garbage in Attack of the Clones ("What a drag!" "I'm quite besides myself!" "Die, Jedi dogs!" Puh-leeze! I'm surprised Anthony Daniels didn't storm off the soundstage at that point.), I don't see why you'd say he would treat the human characters any better. All the rest of them go through poorly constructed, continuity-threatening backstories and horrific dialogue.
As for 3PO, I agree that he was treated like crap, and his lines were the most vile pieces of garbage in Attack of the Clones ("What a drag!" "I'm quite besides myself!" "Die, Jedi dogs!" Puh-leeze! I'm surprised Anthony Daniels didn't storm off the soundstage at that point.), I don't see why you'd say he would treat the human characters any better. All the rest of them go through poorly constructed, continuity-threatening backstories and horrific dialogue.