I have a level 50 Imperial Agent Operative and level 32 Sith Warrior. I have to say that I enjoyed the operative story line very much. The story picks up at the end of Act 1, then Act 2 kicks a**, and Act 3 was good but the ending was meh. I thought I would end up hating Kaliyo as she reminded me of Jack from ME2, but I ended up marrying her because she became an interesting character which liked all my DS choices. I found all the IA companions very interesting too.
My level 32 Sith Warrior is absolutely awesome. I just finished Act 1 and I have to say, if you're rolling DS and want a force sensitive, then roll a warrior. Some of the cutscenes are the best! Just love how bas a** they make you feel. Definately like a Darth Vader. I haven't recieved all my companions just yet but I have to say they're great as well. Vette is hilarious, love her character. The rest are great too. That's my two cents