"With a mini series you can give the story a proper sense of pacing, a proper sense of closure"

Garth Ennis is suggesting that a mini series is an excellent method to narrate. By having a restricted variety of episodes, the story can be told in such a way that allows for an appropriate sense of pacing. This implies that the story can be informed in such a way that enables the plot to unfold in such a way that is natural and interesting. In addition, a tiny series allows for a proper sense of closure. This means that the story can be informed in a way that allows for a gratifying conclusion. By having a limited number of episodes, the story can be told in such a way that enables a gratifying ending that ties up all the loose ends. This enables a story to be informed in a manner that is both interesting and satisfying.