This is one thing that always bugged me about Bioware games. The villains are made so fiendish, so nasty....not just in their actions, but in their everyday conversation....that it's impossible to take them seriously. KOTOR was no exception.
Example: the Sith characters you meet. Every last one of them is bullying, arrogant, obnoxious, and apparently without any redeeming qualities. Now, at the highest levels (Darth Malak), this makes sense; he IS a Sith Lord, dedicated to personal power at the expense of everyone else. But shouldn't the lower ranks have some ideal motivating them beyond pure power lust and cruelty? One quickly begins to wonder just how the Sith manage to find recruits when their only ideal is 'let's conquer the galaxy and be mean to people.'
I refer to these characters as 'Johnny Quest' villains. If anyone ever watched that show, either the old or new version, you'll recall that there was hardly a single line uttered by the 'bad guys' which wasn't dedicated to showing how evil and nasty they are. You couldn't sympathize with them in the least because they were made purposefully unsympathetic.
Remember, even the worst of causes (if it wishes to have any mass appeal) has managed to put some kind of cover on their excesses and lure idealistic recruits. The Nazis potrayed themselves as the defenders of European civilization against Soviet barbarism. The Soviets presented themselves as the defenders of the workers of the world against the enslavement of Capitalism. Hell, even the modern day Islamic extremists aren't just killing people to 'be evil', but rather because of a fanatic belief in the will of Allah.
As for the Star Wars Galaxy, one has only to read the manual of TIE Fighter to understand the appeal of the Empire; 'Stability' against 'Lawlessness.'
My appeal to the honorable designers of KOTOR II; please don't make the 'Sith Lords' Johnny Quest villains. Make them at least slightly sympathetic; make it so we can understand their actions and choices.
Thank you.