I know that author tags are frowned upon (because they are misused a ton), so is this tag any different? Should I get rid of it?
We've never used actor tags before, so there's no precedent for this.
Also, there's really no need for actor tags. Author tags might sometimes be useful, because authors define the style and subgenre of the writing - people might be interested in looking at all questions about all stories by a particular author. But actors usually don't contribute much to the story - they help bring it to life, they might give it a touch of their own personal flair, but people are unlikely to want to search for a list of all questions about all films that a particular actor has starred in.