Tagging is an imperfect way to catalog (anyone can add a tag, trying to impose authority control on user tags can be exhaustive, and most tagging systems only allow searching on one term at a time). The benefits to open tagging (collaboration, relativity to the individual user, social aspect, open-endedness) don't really add much benefit on this site.
The purpose of the tags is to make questions searchable and groupable. Ideally they would be limited to things people would actually like to limit by. With keyword searching available, many of our tags are redundant.
- I agree with @ChristianRau that appending the title of a TV show with -TV when it is not clearly a TV show makes sense (and it is shorter that -TV series). I think the appendage is unnecessary when there is no ambiguity.
- I also agree with @TylerShads that having a TV-Series tag is useless, as are many of our tags.
If we are going to attempt to create structure for our tags, maybe we want to make a list of things people might want to search on:
- name of show or movie
- name of actor, director
- genre (we could create a list - romance, horror, western, Bollywood...)
- type of question - identify (for identifying actor or title), plot explanation, analysis, production, soundtrack, or trivia ("what was the first..." or "what's that poster on the wall in...")
We have odd tags like specific-scene, ending, prequel, imdb - who is going to want to limit their search to all the "specific-scene" or "prequel" questions?
Alternately, we could just let people tag away, because that's how tags work in an open system. Maybe we worry too much about how they are used and whether they are useful at all. How many of you ever click on a tag other than a title to limit the list of questions to those? Maybe no one is really using the tags and it doesn't matter? Maybe letting the user choose his own tags gives him "ownership" of his question, just like picking a title for it does. Maybe we need to think about how well we could manage imposing structure on our tags if we had 3 or 5 or 10 times as many questions? If our goal is to grow BIG, we might need to come to grips with the fact that ultimately we aren't going to be able to do anything about the tags.
So there's an answer from both sides of the coin!