The lightsaber duels were quite cool, especially when Kit grabbed the second lightsaber. I still can't forgive Episode III for doing absolutely nothing with Grievous's four-armed lightsaber potential.
I think my favorite part of the episode, though, was when the clones fired the grapple lines onto Grievous. The scene seemed to animalize Grievous, like he was just some dumb beast they were taking down.
Of course it was cool to see the Sith engage Jedi in a way where the heroes were basically incidental, just parts of the overall plan and not the actual targets. And it was cool to continue to get episodes about characters other than Anakin, Obi-Wan, etc. It's definitely a strength of this series.