I could only give this a 7 due to two things irritating me intensely: Burnham completely ignoring Nhan when she was potentially dying on the floor, and the lack of any on screen reason for why Nhan and Airiam couldn't have been beamed back. You don't die instantly in a vacuum either, so it should have been possible to retrieve her even after she'd been blown out of the airlock.
I'm not normally one to nit pick, but when a character is killed off there shouldn't be an easy way to save them that went unexplored for no apparent reason.
It also felt like the sort of situation Trek crews normally find a way to solve. Instead, it was out the airlock with Airiam.