theyr good because it gives u time to get comfy/food nd w.e..
and they give time for th film to set its scene whilst theyr playing.
I find that i enjoy watching most of them. I'm happy to do so with all movies. Only however, if it is relevant. They have to have something to do with the film for me to enjoy them.
I don't think they tend to take anything away from the experience, but they often don't add anything either, making them feel unnecessary unless they are used cleverly to create an atmosphere that helps set up the atmosphere of the film/game.