It might be a function of where you are playing. I just started again after not playing for a year. I didn't think things were so bad - I got occasional ability lag that was worse than it should be in modern games, but wasn't THAT bad. Then I got to Belsavis as a Republic player (a planet lots of people have complained about). The game is completely and totally unplayable. I have difficulties getting on my mount. My companion generally can't even get into a fight. Etc. I've tried everything, including playing at very off times. I can't advance because of it, and since Bioware has shown no desire to fix this in a reasonable amount of time, I will be losing a lot of my subscription time. Looks like I won't be returning to this game in the future. A shame because I was having fun til I hit a specific planet.

Exar Kun used a blue lightsaber. And as seen in Kotor II, Freedan Nadd had a bronzish lightsaber, so I guess that counts as a lightside color too. Oddly enough, I don't think that any Sith had ever previously used a purple lightsaber, which they seem to get a lot in TOR.

I don't really get why people think he is so hard. I mean, it did take me 3 tries, but I admittedly was terrible the first time (derped hard and didn't interrupt him once). The second time I was just stupid (forgot to pop a health pack, I died when he had a sliver of health, and my 20 minute cooldown wasn't up). The third time I had him figured out and took him down at about half health. I didn't have the 20 minute cooldown either since it was still down. I was level 24 btw. Its really just standard play. Let Kira start, Taunt him off when she gets low. Interrupt him most of the time, but you don't really care if he just knocks you back (you can leap back on, and since I'm in Vigilance this actually helped me since it gave me a few seconds of defensive bonuses when I got jumped back on him). Have your CC break ready if he chokes you. Thats all you really need assuming that you have decent gear.