A few days ago someone posted a side project marketing checklist to HN that has many great ideas:
https://news.ycombinator.com/item?id=14942902
31 karma · joined April 27, 2015
Excerpt from https://www.appcues.com/blog/rating-system-ux-star-thumbs/
"In addition to the new rating system, Netflix has new match percentages (up to 100%) to more accurately predict how much users will like something.
...
The new rating system received 200% more ratings in A/B tests, according to Netflix VP of Product Todd Yellin.
When it comes to rating movies and shows, stars reflect the preferences that people want to have, rather than how people actually behave. Todd gave the example of users giving 5 stars to a documentary but just 3 stars to an Adam Sandler movie that they watched over and over again. “What you do versus what you say you like are different things,” said Todd."