The droid arc was pretty unwatchable for me. I didn't think any others were truly bad, though I liked some less than others. I didn't care for most of the Mandalore stuff, I think because I didn't like the Duchess and I didn't see any chemistry between her and Obi Wan so I didn't believe they were former lovers. Part of that is my disappointment with prequel Obi Wan in the movies as well as in TCW.
I'd also like to say, that while many people aren't huge fans of the political episodes, mainly with Padmé, they are very necessary to explaining how and what is happening in the political realm during the Clone War.