It seems that there are two questions pervading this disucssion: 1. Should movies be rated in some way 2. Are any of the rating systems currently in place capable of meaningful categorization While the question of whether movies should be rated seems, for most intents ane purposes, to be nested within the debate over whether this rating should have some kind of inherent authority (rather than simply being additional, editorial information to be taken or left), perhaps the more poignant query is the second question: Is this system valid? If it is not, than all subsequent notions are moot. It seems to me that the inherent problem with all extant rating systems is that they are not fixed; their structure is subjective. A monitoring agent in assigneed a movie (or book or game, etc.) and that person decides its rating. This decision is based on some objective standards; but for the most part, it is particular to that person. It's like a study with a flawed operational definition: All the quantitative rendering of data is worthless if the terms used to define the subject matter are unsuitable to the issue. In this case, there seems to be no falsifiable standards. As such, the system (and, subsequently anything deived from or based upon that system) is useless.