In reply to throwaway7767, who I can't seem to reply to directly, I think recommendations depend how thorough people are about using unique accounts for each user in the house.
I ended up just creating an Everyone profile after being asked once too often why Netflix wasn't keeping track of where people had got to in a series, and the recommendations now are utter garbage, as you'd expect when looking for the intersection of Breaking Bad, Period Dramas, and Fireman Sam. I have a feeling they'd be much better if each person's tastes were segregated.
I ended up just creating an Everyone profile after being asked once too often why Netflix wasn't keeping track of where people had got to in a series, and the recommendations now are utter garbage, as you'd expect when looking for the intersection of Breaking Bad, Period Dramas, and Fireman Sam. I have a feeling they'd be much better if each person's tastes were segregated.