There's nothing wrong with enjoying Sondheim, ever! There's a huge difference between the relationships in Twilight and Passion - the latter was realized and portrayed as a 100% fucked-up relationship by the creators of the show, whereas Stephenie Meyer paints the Bella/Edward relationship as idealized, perfect love.

Juvenile writing style aside, I might actually enjoy Twilight somewhat if the author realized what an unhealthy relationship she'd put her main characters in - and roll with it. Of course, that would mean that Meyer would have to admit that Edward is not the perfect man, which'll never happen - and it still wouldn't help the pages upon pages of melodramatic descriptions of his heart-stopping, sparkly, dazzling beauty.