Boimler being completely fed up with the assignment is great - he knew exactly what he was walking into, but did it anyway (I'm glad it actually had payoff at the end).
Rutherford has finally resolved badgey, and seemingly learnt nothing.
I didn't feel like mariner had a whole lot to do in this episode, she just kind of tagged along.
I don't know about calling it resolved. Badgey is now an omnipotent being currently not interested in killing Rutherford or the Federation. It might not stay that way necessarily.