People make mistakes and equipment breaks down, even in the best of theatres.
It is very unreasonable to expect every showing to be perfect. This rating system gives an idea of what to expect at each theatre, on the average, based on my personal experiences. Your experiences may vary. Mathematically, the more visits for a particular theatre, the higher the confidence that my samples reflect the actual presentation quality, on the average, at that location. Click the theatre name or number of visits to see the theatre description and the list of attendances evaluated at that location.