I got the impression in the way Maul was talking this episode that he no longer considers himself worthy to be considered a Sith. He said he was "destined for so much more" and now he is broken. Sith seem to always have the objective of galactic domination in mind; it seems like Maul now only cares about seeking vengeance. And I'm assuming that even now that he knows he survived, Sidious would no longer consider Maul to be his apprentice or even a Sith, given his failure on Naboo.
Overall, I really enjoyed the episode. I especially enjoyed the fact that when he was informed of the Clone Wars, Maul said something along the lines of "It started... without me," given the impression that even in TPM, he knew before we did what was to come. Very cool.
It also brings me back to wishing Maul hadn't been "killed" in TPM. Because honestly, he could have taken Dooku's place in the other two films no problem and been the figurehead of the Separatist army. The script would have to be modified slightly, but it could have been accomplished quite easily. Sigh. Well, the Clone Wars is the next best thing, I guess.