It was ok for the most parts, some things were great and others sucked.It was a bit too stretched out with artifacts and ghosts.Getting your own apprentice is probably the best part.
However i have to mention that trooper story is far more boring, not sure about Jedi Consular but so far (Act 1) its rather bad one too.
For the future of SI storyline i guess we will have to fight Xalek at some point, and obviously the tensions between Dark Councol members will rise allowing some interesting power changes.