Frankly, I can't stand Thana. She's an arrogant thug. *points at the OP* I've never had her agree with anything I say. She always whines or calls me names, or acts like a teenage girl trying to be tough.
She frankly makes the dark side look bad. She's all about killing and mayhem. No subtletly, no class, no thinking beyond the moment's killing. Just violence, murder and destruction. It's just bad and one-dimensional.
Myself, I frankly kept going "oh, come on" at the screen when she kept being allowed to walk away after insulting me, telling the Republic on me to try to get me killed, and generally acting like a teenage wannabe gangasta thug. By now, thanks to her insulting, horrible, destructive manner, my character would have stabbed her through the gut with a lightsaber long ago.
I keep waiting for the opportunity to kill her. I don't care if it gives me tons of darkside points. I look forward to it. It'll be doing the dark side, the light side, and all of Taris AND the galaxy a huge favour.