I think some clarification is required. Either there is no accounting for taste, or my assumption that 5* is the highest rating was wrong. Or you have to do something very, very, very unexpected and specific to get anything other than okay ending where the master tells that everyone hates your ratings (or a bad ending where random fans poison you via mail).
Hi! If you're trying to find all 4 endings, they are: The Best Ending (where Master tells you you're mediocre; rate everything 5*), The Okay Ending (Master says something along the lines of your ratings were unsatisfactory), Shrik Ending (By opening the slimey, green envelope), and Worst Ending (Car crash; rate everything 1*).