This show started out so strong — putting this cynic with abandonment issues into a fairytale world that's been messed up to deal with her (in her mind) delusional son. But essentially finishing this premise at the end of Season 1 really made the show lose its tension (side note: If you haven't seen the show, I highly recommend watching just Season 1; it actually wraps up pretty nicely). How did the show go on for so many more seasons, you say? Emma. Emma continued to be interesting and provide a contrast to the other characters, and it felt like her plot lines actually moved forward rather than in circles. Beyond that, the other characters were made more interesting by interacting with her — I frankly was not a Regina fan, but the continued tension between those two characters was at least interesting to watch. Henry, Charming, Snow, Rumple, Belle, etc. just felt tired by mid-Season 2 (Regina took a little longer), but Emma pulled them through another few seasons (with the help of a few strong character additions, like Killian).