The Kara/Jimmy subplot feels like wasted potential
At the very beginning of the Jimmy and Kara romance subplot in S3, Jimmy's initial reasoning was that he feels like he isn't enough for Kara, that she only likes him because he's the first guy she met who was nice to her, and that the brainwashed soldier might need some more time learning who she is. That's a really great premise, and it would let the show explore the tension between doing the right thing and Jimmy's feelings for Kara (human heart in conflict with itself type shit).
So I was really frustrated that the show pivoted from that to Jimmy turning into various animals for like 4 episodes instead of actually focusing on these characters. We've learned nothing about why Jimmy is like that (something we've already seen in S1 and S2), we haven't really had any meaningful exploration of Kara's identity except for a few small bits and a pretty random resolution in episode 7, and it doesn't feel like there's any connection to the main plot or to any of the themes presented in this season or the series as a whole. It's a really wasted opportunity.