The Sith Inquisitor wasn't too bad. I'd have liked some more political shenannigans and subtle manipulations thrown into it, but as a general "sith treachery, waiting to be backstabbed, getting your own resources so you can backstab them first", it was fairly entertaining.
Pushed my Jedi Knight to the end of Chapter 2, and got my Bounty Hunter to the end of Chapter 1. I've actually spent some of my game time this week pootling my Smuggler and Sith Inquisitor around on Illum and doing that world storyline and some of the dailies just to see what they're all like. You really rack up the credits doing those.
I've only got my Sith Warrior on Balmorra at the moment, but the class storyline certainly seems fairly interesting so far. Although for some reason my brain edits "Darth Baras" into "Darth Wideload" which does sliiightly affect how seriously I react to certain sections....