Precisely. Joss Whedon, as brilliant a storyteller as he is, has a major problem when it comes to pacing for a television series. His shows tend to be very mythology dependent in that you have to watch the previous episodes to fully understand what's going on now. And while there are other shows that also feature this, such as Heroes and Flash Forward, there's a lot more payoff in each episode whilst Whedon's tend to come later on in the season which can get very frantic towards the finale. Essentially, his style works a lot better with movies and on DVD; i.e. anything that can be watched back-to-back in one sitting or at least large chunks.