Actually how good I think the voice is depends on if it matches what I intended my character to be like. That's why female JC I think I like the most.
JK male voice is the worst one I've heard. Obviously, unless they add some patch where you can adjust the frequency and add effects like distortion to the voice, or alternatively release an expansion with new voice options, you're gonna have a toon which must fit into a predefined personality; well, with the range obviously provided by the light/dark alignment.
I wanted to have a short, mysterious, coarse-sounding pureblood Sith Inquisitor, but I accepted that I had to settle with some British dude who likes to show his eloquence. The whole British thing they got going on with the Empire I actually don't mind.
I also wanted to make an anti-archetypical SW, very -unserious, so I rolled a funny-looking Zabrak with Body type 4. But he's obviously still gonna have the "fear me! I'm serious!!!" thing going on. I reckon it's not to unplausible to have new voice options released. Something to add even more range to the kinda of character you can be. They could have like 3 kinds for each class: Mysterious, what they have now (normal?) and goofy... maybe?