The two ACs are pretty good. You have Guardian which can be a Tank/DPS/AoE DPS (Focus). Sentinel is stricly DPS with Watchman a DOT DPS, Combat a Burst DPS and Focus is the shared AoE DPS.
I went Sentinel Artifices as keeping my sabers/hilts up seemed like a good idea. Others recommend Synthweave as a lot of your companions are good with that. Biochem is decent as well.
I enjoyed It. A bit of a Hero of the Hour with a few twists and turns but nothing like the Agent story.