When it comes to TV shows, I find that even more so than with movies, in order for me to re-watch it, because it's such a big time commitment, it really needs to have very captivating performances. Either that, or it's a comedy show of some type, where you can always just sit down and re-watch a couple episodes for a laugh. When it comes to movies, you might revisit a stupid 90 minute action flick, cus it's just good flashy fun....if you revisit a whole TV show, you're looking at days upon days of pure run-time, probably consumed over several weeks. To embark on that undertaking for a story you already know, action you've already seen, twists and cliffhangers you already experienced, etc. you really need to be drawn in to the characters as they're being portrayed. The actors can't just be decent, or serviceable vehicles to move the story forward. They have to absolutely embody their role, they need to have a certain level of charisma, or magnetism, and they need to have a real character arc that gives them new material to play with.