I loved the Crystal Crisis arc! It gave us Utapau before RoTS and had many great Obi-Wan/Anakin moments. The character I thought was most improved though was Grievous. He actually beat Obi-Wan and had some pretty good moments, this might have been the closest he got to his Legends CW version in the whole show.

^Pretty much covered my feelings. This is one of the extremely few times in the Clone Wars 08 series that Grievous felt like a threat. Ironic that this happened on the same planet that he’s fated to die on.

Grievous, followed by Anakin

I would say

But I believe Obi-Wan and Anakin were improved as well