Possible Duplicate:
Should tags for individual movies be encouraged
Should movies have their own individual tag?
e.g. If a movie is about inception does it really need its own inception tag?
This is merely a question about how specific does a tag need to be.
Tags do not merely form part of the content of the question - it is meta information that allows the question to be found more easily.
The purpose of tags to allow someone to search for questions of a particular topic. You can have favorite tags which color the questions differently on the list, and you can have tag subscriptions - be emailed when questions about your topics of interest come up.
As a site about movies and TV, it seems reasonable to tag a question with the title of the movie or series it relates to.
