You've just written a story with an interesting and winding plotline that takes the story beyond what the genre usually calls for, or touches on several other genres. You want the plot/scene/characters to surprise your readers with unexpected twists and turns hoping the surprise itself will entertain.
Are you then spoiling those surprises by an exhaustive listing of tags? I know they provide a search capability that allows readers with the interests you've tagged to find your story, but is it worth it? Do they entice an otherwise reluctant reader? ... or give away the story before they've even read it?