The main Jedi storyline continues to be the highlight with the overall rebellion storyline coming in a close second. Whenever an episode is pushing one or both of these stories forward it's a really good episode.
When Rebels instead decides to do a one off or side-character focused episode it's much more "meh". It's never as bad as the worst episodes of Clone Wars were but I constantly want them to get back to the main storylines.
And the main storylines are just great! The season ended with a fantastic finale that sees Kanan, Ezra, Ahsoka, and Darth Vader all in interesting places. It also manages to re-introduce Darth Maul into the universe and opens up lots of potential for him in the future.
I continue to be really happy with Rebels and if you're a Star Wars fan you should definitely check it out!