Meh. I really think it just boils down to "We wanted to create the strong, silent type of character". You see those in so many places, after all. It's just one of the common archetypes, I guess.
Problem is, it's all too easy to make those characters into 'strong, boring character'. Kivan is a good example of that, the man just grunts! Valygar is better, he has a personality at least, but in the game, he still feels underdeveloped. Besides, my general impression in RL, is that the 'strong silent' guys are often silent because they don't have anything worthwhile to say.
No, give me somebody nicely verbal any day.
A great shame, that they didn't do more with T3.
I suppose there's not all -that- much you can do. Droids are supposed to be pretty advanced, but I doubt all of them are fully sentient. Plus, astromechs weren't intended to do a lot of direct interfacing with people, the way protocol droids were, so I suppose it makes some sense that you can't really "talk" to T3. Wish they'd done more with T3/HK banter. I always found it funny that R2D2 was apparently a bit of a potty mouth (judging by C3PO's reactions), so you'd imagine that a droid like T3 would get along famously with HK. They could trade insults in machine language, or threaten to turn the other into scrap metal.
Oh, that *would* have been great!
I'd have loved to have more HK banters in general.
