This bit from Alan Sepinwall’s review of the last episode of Lost is key to why I loved it, and the series as a whole.
“Ultimately, “Lost” didn’t succeed because of the mythology. We’ve seen too many examples of mythology-heavy, character-light series fail over the last six years to think that. “Lost” succeeded on emotion, whether that emotion was fear of the monster in the jungle, or grief over Juliet dying, or joy at Desmond reuniting with Penny, or thrills at Sayid’s breakdance fighting and Hurley riding to the rescue in the Dharma bus. When “Lost” was really and truly great, it locked you so deep into the emotions of the moment that the larger questions didn’t really matter.”
The rest of the review is also interesting, if you care.