Why don't rating systems just give a simple yes/no question to the reader. In the case of rating a movie, just ask "Would you watch this again?" or in the case

Why don't rating systems just give a simple yes/no question to the reader. In the case of rating a movie, just ask "Would you watch this again?" or in the case of purchasing a product from Amazon, "Would you purchase this item again?" I'd rather a boolean system than one where someone's 4-star rating is different than my 4-star rating. Whenever I see a multi-star rating system, I remember back to a prof I once had that said "The top grade is B+. A's are reserved for God." Albeit disgusting, it taught me that everyone has a different rating scale.