Do they need a manual rating now with so many subscribers? If lots of people give up watching something after 15 minutes then it could be considered "not very g

Do they need a manual rating now with so many subscribers? If lots of people give up watching something after 15 minutes then it could be considered "not very good", and if people watch something multiple times then it could be "very good". Yes there are holes (people may give up on something good because they don't like the genre) but in general?