I was so pumped to hear I would convert a jedi, but it was such a let down. The Act 1 was truly disappointing. I felt that the whole immortality/body transfer was too common, so I was completely surprised to learn that that was all Tulak's artifacts were for.
I feel like the SI got too little done in the story. I was also put off with my first lightsaber just being a hand me down tossed by Zash.
Also with the Sith storylines in general, I never felt like an apprentice. I killed my way through Korriban just to become your errand boy? You have got to be kidding. I felt like an apprentice to my trainers rather than my Master.