I think they absolutely nailed the Fiennes / Samson relationship, friendship, recovery arc. I was genuinely concerned for Samson's safety multiple times. He was basically Wilson.
I was annoyed about the cure aspect, I hope his notes are documented and they have them.
For the Jimmies, they were fine. They played their part.
Glad that Cillian / Jim is back and will hopefully play a larger role in part #3. I am curious how the Kelly encountering another Jim go or if they will just let the name be coincidence and drop it.
I am worried Samson will be off'd by unknowing Kickass but he is an Alpha and seems to have retained his durability even while regaining parts of his mind. For the punch, I do think he will die, but perhaps he will get a Hodor moment as the rest of the infected seem to take issue with him now.
I feel like part 3 will drop and unite Spike, Kelly, Jim, <daughter>, and Kickass. Will also be curious if the pregnant lady that ran away comes back with a team from a different village to close the loops.