This might be the saddest, most disjointed episode of the season, which is unfortunate because it comes at a critical time for Harley's arc coming into the back half.
Everything with the Cobb Squad - great. Perfect. King Shark's nautical escapades...probably the weakest C-plot of the show for me. The drama with Ivy and Harley comes at a perfect time, but since the comedy in the underwater cutaways falls so flat, nothing really alleviates the more dramatic moments of the episode.
This sort of felt like they were grasping at straws to stretch out the time in order to make the events of the next few episodes feel earned - like you've been waiting for them. I think this episode accomplishes that, but doesn't really give itself any legs to stand on of its own. A hiccup in an otherwise phenomenal season.